Overview
- Genetic predisposition
- Insulinoma
- Hypothalamic disorders
- Overeating
- High-fat diet
- Decreased physical activity
- Prescription medications (e.g., steroids, phenothiazines, tricyclic antidepressants, antiepileptics, antihypertensives)
- Psychological factors (e.g., disturbance in body image, reaction to separation or death)
- Familial predisposition
- Sedentary lifestyle
- High-fat diet
- Cushing's disease—characterized by weight gain in the face, thorax, and abdomen, but sparing the buttocks and extremities
- Hypothyroidism (60% of patients have only a modest weight gain)
- Hypothalamic tumors (e.g., craniopharyngiomas)
- Stein–Leventhal syndrome (in women)—characterized by obesity, hirsutism, and infertility
- Klinefelter's syndrome (in men)—characterized by increased adipose tissue and reduced muscle mass
- Fasting serum glucose
- Thyroid function tests
- Serum cholesterol and triglycerides
- Hyperplasia of adipocytes: Even if weight is lost, the number of fat cells is fixed.
- Hypertrophy of adipocytes: Cell size will return to normal with weight loss.
- Generally not necessary for diagnosis
- Dual-energy X-ray absorptiometry—to analyze body fat
- Magnetic resonance imaging and computed tomography—to measure regional fat distribution
- Waist measure—above 35" in women or 40" in men is abnormal
- Waist: hip ratio—to measure abdominal girth (>0.85 in women and >1.0 in men is abnormal)
- Body-mass index (BMI)—to measure the level of obesity (BMI of 20 to 25 is considered normal)
- Weight and height tables (does not distinguish between obesity and overweight)
- Skinfold thickness measured by skin calipers (triceps, biceps, subscapular, suprailiac)—to estimate total body fat
- Underwater weighing—to calculate fat-free mass and body fat.
- Measure total body water (fixed fat-free mass (FFM) equals water mass/0.73), which is subtracted from total body weight to obtain total body fat.
- Lifelong lifestyle changes (e.g., exercise, behavior modification) and diet modification are necessary to control weight in obese patients. Many obese patients may have consumed more calories than they metabolized in their weight-gaining phase but currently may be eating enough merely to maintain weight gained previously.
- Health care providers must assess the risks associated with obesity on an individual basis, using the BMI and fat distribution as well as comorbidities as guides for treatment.
- Risk assessment may be critical to the process of setting goals and providing motivation.
- No drug treatment has been shown to be safe and effective for long-term weight loss.
- Surgical therapies for morbid obesity include gastric bypass (Roux-en-Y procedure), or stapling and liposuction for moderate fat redistribution.
- It is important to enroll family members, especially spouses, in any lifestyle and diet changes that will affect the interactions of the relationship. Family activities such as shopping, cooking, and eating out all have an impact on diet and caloric intake.
- Diuretics—for temporary use to reduce water retention; does not reduce adipose tissue stores
- Ephedrine (20 to 60 mg/day) plus caffeine (200 to 600 mg/day)—to transiently increase the basal metabolic rate. (These over-the-counter drugs should not be taken by patients with heart disease, high blood pressure, thyroid disease, diabetes, or an enlarged prostate.)
- Protein: While the standard weight loss diet is low protein, high complex carbohydrates, some people will do better with a high protein, low carbohydrate diet. Regular meals that contain the protein are important for blood sugar stabilization. In either diet, it is important to use many foods that the patient enjoys. Liberal consumption of oat bran or garlic helps lower lipids slightly. Anecdotally, some people lose weight by eating protein at breakfast, which decreases afternoon or pre-dinner gorging and cravings for sweets.
- Fluid: Six to eight glasses daily of nonsugared, caffeine-free drinks flush toxins, and increase a sense of satiety.
- Fiber: Increasing dietary fiber (e.g., fruits, vegetables, psyllium, chitin, guar gum, glucomannan, gum karaya, and pectin) promotes weight loss by enhancing blood sugar control, reducing the number of calories that are absorbed, and increasing satiety.
- Allergies: Many people find that avoiding allergenic foods (wheat, dairy, soy, eggs, and citrus) allows for diuresis and improved digestion. Other allergic foods may be discovered by using an IgG ELISA food allergy test.
- Multiple vitamins to address any dietary imbalances
- Chromium picolinate (200 to 500 mcg one to two times per day): claimed to preferentially burn fat, proven to increase insulin sensitivity, stabilize blood sugars. Helpful in those patients with sugar cravings.
- Vitamin C (3,000 to 6,000 mg/day) speeds up metabolism, acts as an anti-inflammatory, and is needed for cholesterol metabolism.
- Essential fatty acids (primrose oil, 2 to 4 g/day; flaxseed oil, 1 to 3 tbsp./day): One study showed a reduction in appetite and some weight loss without dieting. Fat cravings may be exacerbated by a fatty acid deficiency.
- Lecithin, choline, methionine: (1 g/day of each) aids proper fat metabolism and decreases fat cravings
- Thiamine: (2.5 mg/day) plays a role in fatty-acid metabolism and may decrease ketone formation, increased ketones may play a role in excessive hunger; in order to avoid imbalance, supplement with B-complex: B1 (50 to 100 mg), B2 (50 mg), B3 (25 mg), B5 (100 mg), B6 (50 to 100 mg), B12 (100 to 1,000 mcg), folate (400 mcg/day)
- Kelp (1,000 to 2,000 mg/day, equivalent to 250 to 500 mcg of iodine per day) may aid in weight loss, as it provides nutrients for thyroid functioning.
- L-glutamine (1,000 mg tid) may blunt carbohydrate craving.
- Coenzyme Q10 is important in fatty-acid metabolism, may help break down fat into energy
- 5-Hydroxytryptophan (5-HTP; 100 to 300 mg/day) to reduce food intake by promoting satiety. Acts as an antidepressant, especially with sleep disturbances
- Fasting: For patients who don't have diabetes, fasting, or juice fasting one day a week is helpful to reset the appetite control system.
- Peppermint (Mentha piperita) carminative, spasmolytic, historically to reduce appetite
- Bladderwrack (Fucus vesiculosus) historic use in obesity
- Parsley (Petroselinum crispum) diuretic, historic use in gastrointestinal conditions
- Dandelion (Taraxacum officinale) diuretic, dyspepsia
- Hawthorn (Crataegus monogyna) reduces peripheral vascular resistance, historically a sedative
- St. John's wort (Hypericum perforatum) antidepressant, historically with nerve pain
- Valerian (Valeriana officinalis) bitter spasmolytic, sedative
- Milk thistle (Silybum marianum) dyspepsia, specifically for liver and gallbladder
- Lavender (Lavandula angustifolia) carminative, spasmolytic, relaxant
- Gentian (Gentiana lutea) carminative, digestive stimulation
- Type II diabetes mellitus (adult-onset diabetes)—rare in individuals with a BMI <22
- Hypertension (blood pressure >160/95 mm Hg)— especially in patients 20% over ideal weight
- Coronary artery disease
- Hypercholesterolemia
- Hypertriglyceridemia as a result of increased insulin resistance and hyperinsulinemia
- Congestive heart failure and sudden death as a result of increased blood volume, stroke volume, cardiac output, and left ventricular end-diastolic volume
- Respiratory problems (e.g., Pickwickian syndrome, pulmonary hypertension)
- Circulatory problems, such as varicose veins and venous stasis, which predisposes patients to venous thromboembolic disease
- Endometrial and postmenopausal breast cancer in women, prostate cancer in men, and colorectal cancer in men and women
- Gallbladder disease as a result of increased secretion of biliary cholesterol
- Obstructive sleep apnea as a result of fat accumulation in the tracheopharyngeal area
- Arthritis as a result of excess stress on joints especially of the lower extremities
- Skin problems, such as acanthosis nigricans
- Eating and exercise habits are hard to change. Most obese patients have long histories of unsuccessful attempts to lose weight.
- Approximately 10% to 60% of patients who attempt diet therapy are able to lose at least 20 pounds; however, only between 10% and 20% of patients are able to maintain their weight loss over time.
- Patients should be told that losing 15 to 20 pounds is often responsible for a 10% to 25% decrease in health risks associated with obesity.
- Gestational diabetes
- Hypertension
- Preeclampsia
- Abnormally large infants resulting in difficult deliveries
- Increase rate of cesarean sections with complications
- Increased incidence of fetal distress and meconium staining