Solution Manual For Medical Nutrition Therapy: A Case Study Approach, 4th Edition

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Answer Guide for Medical Nutrition Therapy: A Case Study Approach 4th ed.
Case 1 – Pediatric Weight Management
I. Understanding the Disease and Pathophysiology
1. Current research indicates the cause of childhood obesity is multifactorial. Briefly outline the roles of
genetics, environment, and nutritional intake in development of obesity in children.
Biological (genetics and pathophysiology):
• 30%-75% of adiposity in children is related to genetics
• In children < 3 years of age, the strongest predictor of adulthood obesity is parental obesity
• Both prenatal undernutrition and overnutrition appear to increase lifelong risk for obesity
• Genetic/hormonal: Some of the most common are:
o Prader-Willi syndrome
o Cushing’s syndrome
o Hypo-/hyperthyroidism
Environmental (sedentary behaviors, SES, modernization, culture, dietary intake):
• Video and computer games and cable and satellite television have made sedentary activities more appealing
o 98% of children in the U.S. live in homes with at least one television
o 80% of children live in homes with at least one DVD player
o Half of the children who live in the U.S. have at least one video game system in their homes
o On average, children spend 3 hours per day watching television
• African American and Hispanic children participate in fewer vigorous activities and/or more sedentary
activities than Whites
• Girls are less physically active than boys
• Dietary factors
o Low intake of vegetables and fruits
o High intake of fast foods and sweets
o Increased consumption of sugar-sweetened soft drinks
o Skipping breakfast
o Increased consumption of refined carbohydrates (ready-to-eat cereals, potatoes, cakes, biscuits, soft
drinks)
Global (society, community, organization, interpersonal, individual):
• Community design focused on cars has discouraged walking and bike riding
• Increased concerns about safety limit times and areas in which children play outside
• Time in physical education classes in schools has decreased
• Limited number of parks and recreation areas in communities
2. Describe health consequences of overweight and obesity for children.
• Orthopedic
o Abnormalities affecting feet, legs, hips
o Slipped capital femoral epiphysis
o Blount’s disease (bowing of lower legs & tibial tortion)
• Neurological
o Pseudotumor cerebri (increased pressure in skull)
o Recurrent headaches
• Pulmonary
o Asthma
o Sleep disorders
o Sleep apnea
• Gastrointestinal
o Cholecystitis
o Hepatic steatosis

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o Gallstones
• Endocrine
o Type 2 DM
o Polycystic ovary syndrome (PCOS)
o Hirsutism
o Acne
o Acanthosis nigricans
o Early puberty & menarche
• Psychological
o Low self-esteem
o Depression
o Peer rejection
• Cardiovascular
o Hypertension
o Hyperlipidemia
3. Jamey has been diagnosed with obstructive sleep apnea. Define sleep apnea.
• Sleep apnea literally means “sleep without breath.”
• It is diagnosed in individuals who experience periods (at least 10 seconds) of not breathing for a variety of
reasons.
• In the case of Jamey, obstructive sleep apnea is caused by the collapse of soft tissue in the throat, which
effectively blocks her air passage.
4. Explain the relationship between sleep apnea and obesity.
• Strong correlations exist between weight and occurrence of sleep apnea, especially with the size of a
person’s neck and visceral fat.
• Larger neck sizes put a strain on the airway, and visceral fat puts pressure on the lungs, decreasing lung
function (although the function is not decreased during waking periods at rest).
• Additionally, Jamey may have tonsillar hypertrophy (another factor to consider with sleep apnea).
II. Understanding the Nutrition Therapy
5. What are the goals for weight loss in the pediatric population?
• Since children are still growing in height, weight-loss goals should be realistic and should not necessarily
attempt to fully normalize weight.
• For children at risk for overweight with no identified complications, maintenance of current weight is
recommended. Prolonged maintenance will allow a gradual decline in BMI units as children grow in
height.
• For children who are overweight and those overweight with complications, gradual weight loss is
recommended.
• Rate of weight loss should be based on health risks and recommended with caution. Primary goals of
treatment are:
o Promote healthful lifestyle behaviors to achieve and maintain a desirable body weight
o Well-balanced diet that supports growth and development
o Behavior modification
o Increased physical activity
o Family involvement
o Improve/resolve complications of obesity if present
6. Under what circumstances might weight loss in overweight children not be appropriate?
• Pregnancy
• HIV/AIDS

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• Oncology treatment
• Severe psychiatric disorders
• Metabolic diseases such as Prader-Willi syndrome
7. What would you recommend as the current focus for nutritional treatment of Jamey’s obesity?
• Involve the entire family and/or all caregivers.
• Encourage family activities that provide everyone with exercise.
• Low-fat, low-cholesterol, reduced-sugar diet per age, weight, or BMI and nutritional requirements.
• Encourage planned meals, especially breakfast. Discourage skipping meals.
• Discourage eating while watching television.
• Avoid use of food as a reward or punishment.
• Stock refrigerator with healthy food and drink choices.
• Family should eat meals together as often as possible.
• Learn to read food labels for healthier food selections.
• Select appropriate portion sizes at home and when eating out.
• Reduce number of meals eaten outside the home.
• Encourage 30-60 minutes of moderate physical activity most days of the week.
• Promote a variety of exercises to prevent boredom or overtraining.
III. Nutrition Assessment
8. Evaluate Jamey’s weight using the CDC growth charts provided: What is Jamey’s BMI percentile? How is
her weight status classified? Use the growth chart to determine Jamey’s optimal weight and height for age.
• BMI: 24.9, percentile: >95th.
• Jamey would be classified as obese. The CDC and others regard this child to be in the highest weight
classification for age.
• The approximate optimal weight for Jamey’s age is 70-72 lbs and her approximate optimal height for age is
55 in.
9. Identify two methods for determining Jamey’s energy requirements other than indirect calorimetry, and then
use them to calculate Jamey’s energy requirements.
• Total Energy Expenditure, or TEE1 (for weight maintenance in overweight ages 3-18 years):
o TEE = 389 – (41.2  age[y]) + PA  (15  weight [kg] + 701.6  height [m])
Where PA is the physical activity factor:
PA = 1.00 if physical activity level (PAL) sedentary
PA = 1.18 if PAL low active
PA = 1.35 if PAL active
PA = 1.6 if PAL very active
o TEE = 389 – 41.2(10) + 1[15(52.3 kg) + 701.6(1.45 m)]
o TEE = 389 – 412 + 785 + 1017
o TEE = 1779 or round to 1800 kcal/day for ease
• kcal/cm
o 12-15 kcal/cm for very low energy needs (sedentary)
o 12 × 145 = 1740 kcal
o 15 × 145 = 2175 kcal
1 National Academy of Sciences Food and Nutrition Board. Dietary Reference Intakes for Energy, Carbohydrate,
Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. Washington, D.C.: The National Academies Press,
2005.

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10. Dietary factors associated with increased risk of overweight are increased dietary fat intake and increased
calorie-dense beverages. Identify foods from Jamey’s diet recall that fit these criteria.
• Whole milk
• Apple juice
• Coffee with cream and sugar
• Mayonnaise
• Fritos® corn chips
• Bologna & cheese sandwich
• Twinkies®
• Peanut butter
• Fried chicken
• Fried okra
• Mashed potatoes with whole milk and butter
• Sweet tea
• Coca-Cola®
11. Calculate the percent of kcal from each macronutrient and the percent of kcal provided by fluids for Jamey’s
24-hour recall.
• Total kcal: ~ 4419; 44% fat, 42% CHO, and 14% protein
• Fluid kcal: ~ 957; 22% of kcal
12. Increased fruit and vegetable intake is associated with decreased risk of overweight. What foods in Jamey’s
diet fall into these categories?
Apple juice, fried okra, and potatoes are the only fruit and vegetables she consumed.
13. Use the ChooseMyPlate online tool (available from www.choosemyplate.gov; click on “Daily Food Plans”
under “SuperTracker and Other Tools”) to generate a customized daily food plan. Using this eating pattern,
plan a 1-day menu for Jamey.
Example (answers will vary):
o AM: 1 c frosted shredded wheat with 4-8 oz skim milk, 1 c orange juice, and whole-wheat bagel (can use a
tbsp of cream cheese or butter if desired). Drink at least 8 oz of water.
o Lunch: PB&J sandwich (use whole-wheat bread), 15 wheat thins (or 21 small pretzels), 8 oz skim milk.
o After-school snack: Turkey sub (2 or 3 slices of deli turkey, spinach, and 1 tbsp low-fat Ranch on hoagie or
preferably whole-wheat bread), 8 oz skim milk. Drink at least 8 oz water.
o Dinner: Beef burrito (2 oz ground beef, 1 oz refried beans, 1 oz salsa, 1 oz cheddar cheese), dress with
tomato, lettuce, onion, corn. 20 oz water (or 12 oz juice).
o Snack: Banana, orange, or any other fresh fruit you like.
14. Now enter and assess the 1-day menu you planned for Jamey using the MyPlate SuperTracker online tool
(http://www.choosemyplate.gov/supertracker-tools/supertracker.html). Does your menu meet macro- and
micronutrient recommendations for Jamey?
Answers will vary according to the answer to #13.
15. Why did Dr. Lambert order a lipid profile and blood glucose tests? What lipid and glucose levels are
considered altered (i.e., outside of normal limits) for the pediatric population? Evaluate Jamey’s lab results.
• The combination of being overweight, nightly urination, HTN, and increased appetite along with a family
history of gestational diabetes are clues that there may be an increased risk for diabetes.
• Weight status, HTN, and family history are all risk factors for CVD, so performing a lipid panel helps to
screen for additional risk factors that can be controlled early on.

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• Altered lab results:
Total Cholesterol > 170 mg/dL
LDL Cholesterol > 110 mg/dL
HDL Cholesterol ≤ 35 mg/dL
Triglycerides ≥ 150 mg/dL
Glucose 60-100 mg/dL
• Cholesterol and triglycerides are fine.
• LDL and HDL levels are dangerously close to being outside of the acceptable range.
• The glucose level is just outside normal range, but she just ate breakfast two hours before she came in. To
be sure, a fasting glucose would be prudent.
16. What behaviors associated with increased risk of overweight would you look for when assessing Jamey’s and
her family’s diets? What aspects of Jamey’s lifestyle place her at increased risk for overweight?
Behaviors to look for:
• Sedentary lifestyle
• Snacks
• Family’s dinner-time ritual: TV trays or together at the dinner table?
• Parents’ knowledge about benefits of fruits, vegetables, whole grains, and physical activity should be
assessed.
• It may help to explain that she feels tired because of the sleep apnea. Once that is treated and she begins a
regular schedule of physical activity she may want to be more active.
Being sedentary is the biggest. She also seems to habitually snack while doing nothing.
17. You talk with Jamey and her parents, who are friendly and cooperative. Jamey’s mother asks if it would help
for them to not let Jamey snack between meals and to reward her with dessert when she exercises. What
would you tell them?
• Snacks between meals are acceptable as long as they are healthy snacks.
o Fruits and vegetables would be ideal.
• Instead of using dessert as a reward, Jamey’s mother should offer to do some kind of activity like going to
the park or shopping with her—anything that will encourage physical activity.
18. Identify one specific physical activity recommendation for Jamey.
• If it’s nice out, Jamey and her mother could go out for a walk in the evenings.
• In inclement weather, Jamey and her mother could play the latest motion video game.
IV. Nutrition Diagnosis
19. Select two nutrition problems and complete PES statements for each.
Following are possible PES statements. It may be helpful for students to initially write more than two nutrition
diagnoses and then prioritize as to the ones most likely to have immediate nutrition interventions.
Clinical:
• Overweight related to physical inactivity and excessive energy intake as evidenced by BMI of 24.9 (>95%)
Intake:
• Excessive energy intake related to snacks and meals consisting of calorically dense foods and beverages
such as whole milk, regular sweetened sodas, and fried foods as evidenced by typical daily caloric intake of
approximately 4400 kcal compared to recommended daily intake of 1800-2000 kcal
(Students could also write a similar PES using "Excessive oral food/beverage intake" as the problem.)

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Behavioral/Environmental:
• Physical inactivity related to overweight, fatigue, and limited PA at school as evidenced by usual activities
limited to playing video games and reading
• Undesirable food choices related to knowledge deficit and low intake of fruits and vegetables as evidenced
by frequent intake of juices, whole milk, sweetened beverages, refined carbohydrates, fried foods, and
high-fat meals
• Food and nutrition knowledge deficit as evidenced by Jamey’s mother inquiring about the use of food
rewards to motivate an increase in physical activity and exercise (in this case an etiology may not be
necessary)
V. Nutrition Intervention
20. For each PES statement written, establish an ideal goal (based on signs and symptoms) and an appropriate
intervention (based on etiology).
Clinical:
• Overweight related to physical inactivity and excessive energy intake as evidenced by BMI of 24.9
Ideal Goal: BMI within normal range and less than 85th percentile
Intervention: Nutrition counseling with focus on behavioral modification (refer to specific interventions
associated with the intake and behavioral problems defined below).
Intake:
• Excessive energy intake (or oral food/beverage intake) related to snacks and meals consisting of calorically
dense foods and beverages such as whole milk, regular sweetened sodas, and fried foods as evidenced by
typical daily caloric intake of approximately 4400 kcal compared to recommended daily intake of 1800-
2000 kcal
Ideal Goal: Average daily kcal intake within recommended range of 1800-2000 kcal
Intervention: Nutrition education to develop alternative foods and beverages that are nutrient dense.
Modify distribution, type, and amount of foods within meals and snacks to include:
• Reduced-fat milk
• Water for thirst instead of sweetened colas
• Decreased portion sizes
• Increase of fruits, vegetables, and whole grains
Behavioral/Environmental:
• Physical inactivity related to overweight, fatigue and limited PA at school as evidenced by usual activities
limited to playing video games and reading
Ideal Goal: Increase in physical activity (can specify an amount or type if desired)
Interventions: In this case, interventions may not necessarily be directed at the etiologies as defined but be
designed to lessen signs and symptoms; therefore, nutrition counseling would use the strategies of goal
setting, rewards and reinforcement (not foods), and social support to promote physical activities that are
realistic and appropriate for both Jamey and her parents. Students should include in their answer the need
for exploring a variety of options that are fun and non-competitive.
• Undesirable food choices related to knowledge deficit and low intake of fruits and vegetables as evidenced
by frequent intake of juices, whole milk, sweetened beverages, refined carbohydrates, fried foods, and
high-fat meals.
Ideal Goal: Even though this PES statement is quite similar to the intake example noted above, the goals
would be defined slightly differently. Instead of a specific caloric goal, goals for this PES would be based
on the amount and type of foods described in the signs and symptoms, such as “no more than 4 oz of fruit
juice daily” or “limit fried foods to one time weekly,” etc.
Intervention: A similar intervention as noted above is appropriate as well.

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• Food and nutrition knowledge deficit as evidenced by Jamey's mother inquiring about the use of food
rewards to motivate an increase in physical activity and exercise
Ideal Goal: Jamey’s mother providing appropriate non-food rewards to motivate an increase in physical
activity
Intervention: Nutrition education stating the purpose and use of family counseling theory and strategies
that include problem solving, social support, and goal setting.
21. Mr. and Mrs. Whitmer ask about using over-the-counter diet aids, specifically Alli (orlistat). What would you
tell them?
No pharmacological agents for weight loss have been approved for use in children under the age of 12.
22. Mr. and Mrs. Whitmer ask about gastric bypass surgery for Jamey. Using the EAL, what are the
recommendations regarding gastric bypass surgery for the pediatric population?
The Expert Committee Recommendations Regarding the Prevention, Assessment, and Treatment of Child and
Adolescent Overweight and Obesity2 include the following criteria for adolescents being considered for weight-
loss surgery:
• Failure of at least six months of organized weight-loss attempts as determined by their primary care
provider
• Severely obese (BMI 40 or greater) with serious obesity-related medical complications or have a BMI of 50
or more with less-severe co-morbidities
• Co-morbidities related to obesity that might be resolved with durable weight loss
• Attainment of a majority of skeletal maturity (generally at least 13 years of age for girls and at least 15
years of age for boys).
• Demonstrate commitment to comprehensive medical and psychological evaluations both before and after
weight-loss surgery
• Capable and willing to adhere to nutritional guidelines post-operatively
• Able to decide and participate in the decision to undergo weight-loss surgery.
• Have a supportive family environment
• Evaluated by a multi-disciplinary team involved in patient selection, preparation, and surgery as well as
immediate and long-term post-operative follow-up care
Potential candidates should be referred to centers with multi-disciplinary weight-management teams that have
expertise in meeting the unique needs of obese adolescents. Surgery should be performed in institutions
equipped to meet the tertiary needs of severely obese patients that collect long-term data on the clinical
outcomes of these patients.
VI. Nutrition Monitoring and Evaluation
23. What is the optimal length of weight management therapy for Jamey?
• Nutrition counseling should include goal-setting, self-monitoring, stimulus control, problem-solving,
contingency management, cognitive restricting, use of incentives and rewards, and social supports
• MNT should last at least 3 months or until initial weight-management goals are achieved
• Weight control is often a life-long condition and it is critical that a weight management plan be
implemented after the intensive phase of treatment
• More contact between the patient and RD may lead to more successful weight loss and maintenance
24. Should her parents be included? Why or why not?
2 Sarah E. Barlow and the Expert Committee. Expert Committee Recommendations Regarding the Prevention,
Assessment, and Treatment of Child and Adolescent Overweight and Obesity: Summary Report. Pediatrics,
2007;120;S164-S192. (P. S185).

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• Family counseling is very important and improves weight management outcomes.
• Parents need to be ready to make lifestyle changes to support the child/adolescent with cognitive behavior
strategies.
• Components include:
o nutrition education on lifestyle behaviors and their relationship to chronic disease development
o modification of the home/school environment to enable the adolescent to make wise food choices
o self-monitoring and motivation to change by modeling behaviors and contracting
25. What would you assess during this follow-up counseling session?
• Accurate measurement of height and weight, plotted on CDC Growth Chart
• 24-hour recall with either FFQ or food record
• Identify areas that have been changed and can be changed
• Patient’s and parents’ motivation to change
• Physical activity record/recall
o type of physical activity adolescent participates in
o type of physical activity parents participate in
o time spent watching TV, video games, or on computer
• Real or perceived limitations
• Body image
• Ethnic or religious practices and beliefs related to food
• Use of vitamins, supplements, and alcohol or drugs by patient

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Answer Guide for Medical Nutrition Therapy: A Case Study Approach 4th ed.
Case 2 – Bariatric Surgery for Morbid Obesity
I. Understanding the Disease and Pathophysiology
1. Discuss the classification of morbid obesity.
• Body mass index (BMI) is usually used as a common method for determining if someone is obese since it
is easy and quick. BMI>30 is considered obese.
• Obesity can be defined as a fat percentage greater than >25% fat in females and >33% in males. However,
this requires tools and skill so BMI is more commonly used even though BMI does not factor in body
composition.
• BMI>40 is considered morbidly obese for both men and women.
• For children, obesity is defined using the CDC growth charts that provide BMI for age data. ≥ the 95th
percentile is considered an obese classification.
• The Dietary Guidelines for Americans have different classifications for obesity. Class 1 is a BMI of 30-
34.9; class 2, a BMI of 35-39.9; and extreme obesity (class 3), a BMI ≥40 kg/m2.
• Waist circumference can be used to determine mild obesity but it is a poor indicator of morbid obesity. A
waist circumference >40 in. men or >35 in. in women indicates obesity or increased risk for CVD. This is
based on the fact that central adiposity is thought to propose a higher risk for CVD than gynoid obesity.
2. Describe the primary health risks involved with untreated morbid obesity. What health risks does Mr.
McKinley present with?
Risks with untreated morbid obesity include:
• Type 2 diabetes: 3 as prevalent among obese persons compared to those with normal weight
• Hypertension (high blood pressure): 3 more common in the obese
• Dyslipidemia (abnormal lipid profile, high cholesterol, low HDL, high LDL, high triglycerides)
• Gallstones: 6 greater risk for gallstones among persons who are obese
• Non-alcoholic fatty liver disease: central adiposity is a risk factor for NAFLD
• Cancer:
• Men are at an increased risk for esophageal, colon, rectum, pancreatic, liver, and prostate cancers
• Women are at an increased risk for gallbladder, bile duct, breast, endometrial, cervix, and ovarian
cancers.
• Coronary heart disease
• Myocardial infarctions (heart attacks)
• Angina (chest pain)
• Sudden cardiac death
• Sleep apnea (inability to breathe while sleeping or lying down)
• Asthma
• Reproductive disorders:
• Men: gynecomastia (enlarged mammary glands in males), hypgonadism, reduced testosterone levels,
and elevated estrogen levels
• Women: menstrual abnormalities, polycystic ovarian syndrome
• Metabolic syndrome
• Premature death: obese individuals have a 50-100% increased risk of premature death compared to healthy-
weight individuals.
• Bone health: obesity can increase chances of osteoporosis or decreased bone mineral density
Health risks Mr. McKinley presents with:
• Osteoarthritis
• Type 2 diabetes
• Hyperlipidemia
• Hypertension

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• Mr. McKinley has been obese his whole life, which puts him at an increased risk for type 2 diabetes,
hyperlipidemia, hypertension, and osteoarthritis.
3. What are the standard adult criteria for consideration as a candidate for bariatric surgery? After reading Mr.
McKinley’s medical record, determine the criteria that allow him to qualify for surgery.
• The patient should be morbidly obese with a BMI ≥40 or...
• ...The patient should be obese with a BMI ≥ 35 and display a co-morbidity such as cardiovascular disease,
sleep apnea, or diabetes.
• Surgery is a resort used when the patient has failed to lose weight by other, less invasive means.
• However, often times, physicians require that a patient lose some weight prior to the operation to
demonstrate that he or she is willing to follow through with lifestyle changes relating to exercise and diet.
• Mr. McKinley is a candidate for surgery because he is morbidly obese with a BMI of 59 (BMI >40) and he
has several co-morbidities including: type 2 diabetes, hypertension, and hyperlipidemia.
4. By performing an Internet search or literature review, find one example of a bariatric surgery program.
Describe the information that is provided for the patient regarding qualification for surgery. Outline the
personnel involved in the evaluation and care of the patient in this particular program.
Internet search information is taken from:
http://www.obesityhelp.com/forums/vsg/about_vertical_sleeve_gastrectomy.html
Qualification information: for low-BMI individuals that should consider this procedure:
• Those concerned by long-term complications of intestinal bypass
• Those who are concerned about a lap-band, or inserting a foreign object into the abdomen
• Those who have other medical problems that prevent them from having weight-loss surgery such as
anemia, Crohn’s disease, extensive prior surgery, severe asthma requiring frequent steroid use, and other
complex medical conditions
• People who need to take anti-inflammatory medications; VSG presents a lower risk for development of
ulcers after taking anti-inflammatory meds after surgery
Personnel involved:
• Laparoscopic Associates of San Francisco (LAPSF)
• Obesityhelp.com
• “In more than 700 patients, there were no deaths, no conversions to open and a leak rate of less than 1%.”
(obesityhelp.com)
• Study showed that two-year weight-loss results from the vertical gastrectomy were similar to the roux-en-
Y.
• 57% weight loss using the vertical gastrectomy compared to 41% for the lap-band procedure.
• This case is associated with a team of several doctors from LAPSF.
5. Describe the following surgical procedures used for bariatric surgery including advantages, disadvantages,
and potential complications.
a. Roux-en-Y gastric bypass
Description:
• Most common restrictive-malabsorptive procedure.
• A small pouch is created at the top of the stomach, which restricts food intake by increasing satiety.
The jejunum is cut at the distal end and is attached to the small pouch at the top of the stomach, which
bypasses the rest of the stomach, the duodenum, and the first part of the jejunum in order to restrict
digestion and absorption.
• The proximal end of the jejunum that is draining the stomach is surgically connected to the lower end
of the jejunum, allowing for secretions from the liver, gallbladder and the pancreas to enter the
jejunum to aid in digestion and absorption.

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Advantages:
• Weight loss is achieved through this procedure by decreasing food intake, increasing satiety, and
deceasing absorption.
• Dramatic improvements in diabetes, sleep apnea, hypertension, cancer, and cardiovascular disease risk.
• Potential 40% reduction in mortality.
• laparoscopic procedure, which is minimally invasive.
Disadvantages:
• Vitamin and mineral deficiencies; may need lifelong supplementation.
• Cannot take NSAIDs after surgery.
• Emotional and physical stamina are needed to be willing to make the necessary dietary and lifestyle
changes.
• Nutrient deficiencies are more common because it is a restrictive-malabsorptive procedure, especially
for fat-soluble vitamins (A, D, E, K), vitamin B12, folate, iron, and calcium.
o The stomach is being bypassed, which results in loss of intrinsic factor, which is necessary for B12
absorption.
o The stomach provides acidity for iron absorption, which may be impaired following this
procedure.
Potential complications:
• Development of gallstones, anemia, metabolic bone disease, osteoporosis
• Ulcers if patient smokes after surgery
• Nausea/vomiting if too much food is consumed
• Dumping syndrome (diarrhea, nausea, flushing, bloating from decreased transit time and from eating
refined carbohydrates)
b. Vertical sleeve gastrectomy
Description:
• Up to 85% of the stomach is removed but leaves the pylorus intact and preserves the stomach’s
function.
• There is a tubular portion of the stomach between the esophagus and the duodenum, restricting
remaining stomach’s holding capacity to 50-150 mL.
• The surgeon places two rows of staples through both walls of the stomach and then cuts through both
walls of the stomach between the lines of the staples, separating the stomach into two sections.
• The section attached to the esophagus and duodenum is removed.
• Procedure causes a decrease in food intake by restricting the stomach’s capacity and is considered a
restrictive procedure.
Advantages:
• Minimal nutrient malabsorption.
• Removing part of the stomach results in a loss of the hormone ghrelin, which further enhances weight
loss because ghrelin plays a role in hunger.
• Dumping syndrome is usually avoided by leaving the pylorus intact.
• Effective for weight loss in high-BMI candidates.
• Laparoscopic, which is minimally invasive.
Disadvantages:
• Weight regain is more possible because it does not involve intestinal bypass. Instead, it relies on a
decrease in food intake.
• Procedure is not reversible.
• High-BMI candidates will most likely need a second procedure further down the road to aid in further
weight loss. VSG acts as a beginning surgery.
Potential complications: Leaks related to the stapling procedure may occur.
c. Adjustable gastric banding (Lap-Band®)

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Description:
• Silicone ring or band is laparoscopically introduced into the abdominal cavity and secured around the
upper part of the stomach to create a small pouch with a narrow opening at the bottom of the pouch
through which food passes into the rest of the stomach.
• The band restricts the stomach’s capacity to as little as 30 mL.
• As time goes on, the band can be adjusted to increase the capacity of the stomach.
• The band is inflated with saline, which narrows the opening at the bottom of the pouch. This delays
gastric emptying, allowing the patient to feel full longer.
• Most common restrictive procedure.
Advantages:
• Complications are least likely to result from AGB compared to other bariatric procedures.
• Hospital stay and post-op recovery are shorter than for the other procedures.
• Band can be adjusted to suit patient’s caloric needs.
• Simple and the least invasive of the procedures.
Disadvantages: Patients lose weight at a slower rate than after restrictive-malabsorptive procedures such as
the roux-en-Y gastric bypass procedure.
Potential complications: Risk of tear in the stomach during the operation; potential for nausea, vomiting,
heartburn, and abdominal pain. The band may slip, which would require additional surgery.
d. Vertical banded gastroplasty
Description: Upper portion of stomach is stapled with a one-centimer hole at the bottom of the pouch that
allows for a very slow passage of food into the lower portion of the stomach. This procedure restricts
overall oral intake due to the stomach’s decreased capacity, aiding in weight loss.
Advantages:
• Simple, non-invasive.
• Procedure is reversible.
• Does not change the normal digestive pathways.
Disadvantages:
• Weight regain is possible because it does not involve intestinal bypass and the pouch may stretch over
time. Instead, it relies on a decrease in food intake
• Breaking of staples.
• Nausea and vomiting if excessive amounts of food are consumed.
• May have difficulty digesting high-fiber foods.
Potential complications: Possible complications associated with surgery, infection, etc.
e. Duodenal switch
Description:
• Portion of stomach removed to reduce stomach’s capacity and thus food intake.
• Pyloric valve stays intact to maintain normal digestion of nutrients.
• The intestinal pathway is re-routed to separate the flow of food from the flow of bile and pancreatic
juices to inhibit absorption of energy-yielding nutrients.
• The pathways are then re-joined before the large intestine, bypassing a lot of the absorption in the
small intestine.
Advantages:
• Keeping the pyloric valve intact reduces the risk for dumping syndrome.
• Significant weight reduction.
Disadvantages:
• More aggressive procedure, which means more complications associated with the procedure.
• Heavy dietary restrictions.

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Potential complications:
• Leaks
• Blood clots
• Bowel obstruction
• Abscesses
• Kidney failure
• Bleeding
• Pneumonia
• Infection
• Osteoporosis
• Anemia
• Deficiencies of vitamin A, calcium, vitamin D, and protein
f. Biliopancreatic diversion
Description:
• Often performed with a duodenal switch
• Restrictive-malabsorptive procedure
• Least frequently performed
• Laparoscopically performed vertical sleeve gastrectomy
• Bypass of food through the intestine, resulting in more weight loss
• Distal part of the small intestine is surgically attached to the stomach
• Secretions from the liver, gallbladder, and pancreas are re-routed so they can eventually enter the small
intestine to aid in digestion and absorption.
Advantages: Greatest amount of weight reduction
Disadvantages: Usually only performed on patients with BMI >50
Potential complications: See complications for duodenal switch
6. Mr. McKinley has had type 2 diabetes for several years. His physician shared with him that after surgery he
will not be on any medications for his diabetes and that he may be able to stop his medications for diabetes
altogether. Describe the proposed effect of bariatric surgery on the pathophysiology of type 2 diabetes. What,
if any, other medical conditions might be affected by weight loss?
• Weight reduction is part of the management of diabetes because it aids in gaining blood glucose control.
• Bariatric surgery restricts food intake to a small portion of food at each sitting, which increases satiety and
helps prevent hyperglycemia.
• The controlled food intake helps with keeping blood glucose levels from becoming too high.
• Weight reduction also reduces insulin resistance. Receptors become more sensitive to insulin when an
individual is in a more normal weight range. The chronic inflammatory state associated with obesity
hinders glucose uptake into the cells.
• Other conditions that may be affected by weight loss include cardiovascular disease. If hyperglycemia can
be controlled, it may reduce the damage to the blood vessels, which aids in reducing risk of cardiovascular
disease.
• Sleep apnea will be improved with weight reduction, as there is less mass around the respiratory muscles.
• Hyperlipidemia can be improved. As the patient eats more consistently with a decreased capacity, lipid
profiles may begin to normalize as the patient loses weight.
• Blood pressure can be lowered with weight reduction, aiding in resolving hypertension.
II. Understanding the Nutrition Therapy
7. On post-op day one, Mr. McKinley was advanced to the Stage 1 Bariatric Surgery Diet. This consists of
sugar-free clear liquids, broth, and sugar-free Jell-O. Why are sugar-free foods used?
• Sugar-free foods are used to prevent dumping syndrome.

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• Dumping syndrome is characterized by nausea, vomiting, bloating, and diarrhea and is caused by
hyperosmolar foods, which are usually simple carbohydrates.
• The hyperosmolar foods cause water to be pulled into the intestine. This occurs because part of the intestine
is bypassed in the roux-en-Y procedure, which gives less surface area and transit time for absorption.
• In order to prevent dumping syndrome, the Nutrition Care Manual recommends avoiding simple
carbohydrates such as fruit juices or other foods high in sugar.
8. Over the next two months, Mr. McKinley will be progressed to a pureed-consistency diet with 6-8 small
meals. Describe the major goals of this diet for the Roux-en-Y patient. How might the nutrition guidelines
differ if Mr. McKinley had undergone a Lap-Band procedure?
• Since roux-en-Y is a restrictive-malabsorptive procedure, it is important to consume very small meals,
usually 2-4 Tbsp at one time, to decrease the risks of dumping syndrome. 6-8 small meals are needed
because the stomach has a very limited capacity.
• Other major goals of the diet include:
o Protein-dense foods (at least 60 g of protein per day); protein helps with the healing process after
surgery and it helps with satiety so the patient can recognize that he/she is full before eating too much.
Protein should be consumed first at the meal.
o Avoid high-sugar beverages and foods.
o Liquids should be consumed between meals to avoid dumping syndrome. Hydration is important (6-8
cups of low-calorie liquid per day).
o Eat slowly to avoid blockage or nausea
o Stop eating when full. This will prevent nausea/vomiting.
o Vitamin/mineral supplementation is probably warranted.
o If Mr. McKinley had a lap-band procedure, his risk for vitamin and mineral deficiencies would be
lower because a lap-band procedure is restrictive but not a restrictive-malabsorptive procedure. A lap-
band procedure simply reduces the size of the stomach without bypassing intestinal absorption.
o In addition, the lap-band procedure is adjustable, so food intake can be suited to meet the patient’s
needs.
9. Mr. McKinley’s RD has discussed the importance of hydration, protein intake, and intakes of vitamins and
minerals, especially calcium, iron, and B12. For each of these nutrients, describe why intake may be
inadequate and explain the potential complications that could result from deficiency.
• Calcium: Since most of the stomach is bypassed, there is a reduction in the gastric acidity that aids in
calcium absorption, causing potential deficiencies and risk of osteoporosis.
• Iron: Iron is mostly absorbed in the duodenum of the small intestine. It also needs the acidity from the
stomach, which is mostly bypassed in the roux-en-Y procedure, to aid in absorption. Therefore, iron may
be malabsorbed and an iron deficiency may occur. Iron deficiency may lead to iron-deficiency anemia.
• B12: B12 is absorbed in the ileum, but it requires intrinsic factor, which is released from the stomach. The
stomach is mostly out of commission, so the absorption of B12 is affected. B12 deficiency may lead to
pernicious anemia and a folate deficiency.
• Protein: Since the stomach’s capacity is very limited, a the patient must restrict their food intake to about
2-4 Tbsp per meal. Protein should be taken first to help with satiety and to aid in healing after surgery. In
case a person cannot tolerate the whole meal, it is important for protein-dense foods to be consumed so the
person does not break down lean body mass when losing weight. Protein malnutrition may also lead to
further edema and other micronutrient deficiencies.
• Hydration: Hydration is key but liquid should be consumed between meals to minimize dumping
syndrome. Hydration goes hand in hand with protein intake. With risk of dumping syndrome, excess water
could be lost from diarrhea, so it is important to stay adequately hydrated to prevent dehydration. In
addition, as one loses weight, water weight will be lost, making hydration very important.
III. Nutrition Assessment
10. Assess Mr. McKinley’s height and weight. Calculate his BMI and % usual body weight. What would be a
reasonable weight goal for Mr. McKinley? Give your rationale for the method you used to determine this.

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• BMI = 703  410 lbs/70 in./70 in.= 59
• % UBW = (410 lbs/434 lbs)  100 = 95% UBW
• A reasonable weight goal would be to lose 30-35% of body weight within 1-2 years post-op.
0.3  410 = 123 lbs, 410-123 lbs = 287 lbs.
0.35  410 = 143.5 lbs., 410-143.5 = 266.5 lbs.
Therefore, since research shows that most patients lose about 30-35% of their weight, it would be
reasonable for Mr. McKinley to lose between 123 and 267 lbs. within the first year or two.
• Studies also show that 60% of patients typically maintain weight once weight is lost post-surgery.
• Another goal would be to get Mr. Mckinley’s BMI below 30, since evidence shows a significant reduction
in the risk for co-morbidities associated with obesity when BMI is less than 30. This is equivalent to a goal
weight <209 lbs.
11. After reading the physician’s history and physical, identify any signs or symptoms that are most likely a
consequence of Mr. McKinley’s morbid obesity.
• Elevated blood pressure (135/90 mmHg): more strain on the blood vessels due to obesity
• Pitting edema
• Skin rash (impaired blood flow to the skin due to obesity)
• Elevated respiration rate: hard to breathe with excess weight compressing lungs and other respiratory
muscles
12. Identify any abnormal biochemical indices and discuss the probable underlying etiology. How might they
change after weight loss?
• Potassium (high): Serum potassium levels may be elevated post-surgery or could be an acid-base
imbalance. Weight loss may improve levels but it is probably a side effect of the surgery more than obesity.
• CPK (high): CPK is an inflammatory marker. This could be due to surgery and destruction of tissue from
the roux-en-Y surgery. In addition, individuals with chronic obesity often exhibit chronic inflammation,
which may result in higher CPK values. In this case, it is probably due to surgery. Once healing occurs, the
CPK value should be improved; weight loss may also help.
• Glucose (high): Because of uncontrolled type 2 diabetes. Obesity contributes to uncontrolled blood glucose
levels and obesity is a major risk factor for type 2 diabetes. Glucose values will probably decrease with
significant weight loss.
• HbA1c (high): Average blood glucose over 8-12 weeks. High due to uncontrolled diabetes. High blood
glucose allows for more hemoglobin to be glycated with glucose. May improve or be lowered with weight
loss as glycemic control can be helped by weight reduction.
• HDL (low): Obesity is positively associated with dyslipidemia, which would explain low HDL levels. HDL
(high density lipoproteins) remove cholesterol from the body tissues and bring it back to the liver.
• LDL (high): Obesity is associated with hyperlipidemia, which is why the cholesterol or lipid profile
numbers are out of range. An alteration in lipid metabolism occurs in obesity, which may decrease the
activity of the lipogenic enzyme that down-regulates LDL receptors. Lipid profiles tend to be normalized as
individuals reach a more optimal weight.
• Triglycerides (high): An excess amount of fat or obesity contributes to high TG levels. Most of the fat
from food is consumed in triglyceride form.
• Cholesterol (high): Same reasoning as LDL and other lipid profile values. Value will probably decrease
once weight loss is achieved.
13. Determine Mr. McKinley’s energy and protein requirements. Explain the rationale for the method you used
to calculate these requirements.
• Mifflin-St. Jeor used to calculate energy needs according to the Nutrition Care Manual under “bariatric
surgery.”
• RMR (men) = (9.99  actual weight in kg) + (6.25  height in cm) – (4.92  age) + 5
wt.= 410 lbs. or 410lbs./2.2 = 186 kg; ht. = 70 in.  2.54 = 177.8 cm

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