Weight gain and loss
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Transcript of Weight gain and loss
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Daniel Eshetu
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IntroductionWeight is generally stable
Food intake = Energy expenditure
Coordinated control of the hypothalamus
“Feeding” center
“Satiety” center
Food intake
Availability of food
Attractiveness of food
Emotional factors
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Introduction (Cont’d)
Energy expenditure
Basal metabolism – 50%
Physical activity – 40 - 50%
Voluntary change in weight – not worrisome
Involuntary change in weight – may indicate disease
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Weight Gain
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Mechanisms of weight gainExcess muscle – exercise
Excess fat – food intake > energy
expenditure
Excess water – fluid retention,
over hydration
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Nature vs NartureGenes
Fuel homeostasis
Energy expenditure
Hunger/satiety
EnvironmentPhysical inactivity
Food
Scio cultural factors
Intrauterine programming
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Environment Increased intake
Increased portion sizes
energy dense foods
High glycaemic index foods
Soft drinks
Added sugar
Easy access to foods
Marketing
Decreased expenditure
Reduced exercise
Increased automation
Vehicles
Sedentary schools
Sedentary workplace
Elevators/Escalators
TV/Computer
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Other causes of Weight GainAging – slowed metabolism
Pregnancy
Endocrine & Other Medical Disorders
Cushing’s Syndrome
Hypothyroidism
Polycystic ovary syndrome
Hypogonadism
Some inherited diseases/genetic syndromes
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Causes of Weight Gain (Cont’d) Drugs
Corticosteroids
Lithium
Tranquilizers
Antidepressants
Emotional factors
Anxiety
Depression
Guilt
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Lifestyle Factors
Overeating
Physical inactivity
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Classification of BMI (in Kg/m2)Underweight --BMI <18.5
Normal weight -- BMI ≥18.5 to 24.9
Overweight — BMI ≥25.0 to 29.9
Obesity — BMI ≥30
Obesity Class I — BMI of 30.0 to 34.9
Obesity Class II — BMI of 35.0 to 39.9
Obesity Class III — BMI ≥40
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Prevalence of overweight, 2008
Source:WHO
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Prevalence of CVD risk factors in A.A
Risk FactorPrevalence (%)
Males Females
Overweight 20 38
Obese 2 10
Low level of Total Physical Activity
17 31
High BP (> 140/90 mmHg)
32 29
Fikru et al., BMC Cardiovascular Disorders 2009, 9:39
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Pear Shaped Fatness in WomenExcess Fat Deposited
Hips
Buttocks
Thighs
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Apple Type Fatness in MalesExcess Fat Deposited
Abdomen (Beer Bellies)
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Health Risks of ObesityIncreased Morbidity
Type 2 Diabetes
Hypertension
Dyslipidemia
Coronary Heart Disease
Stroke
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Health Risks of Obesity (Cont’d)• Increased Morbidity
Cancer (endometrial, breast, colon)
Poor Quality of Life
Psychosocial Dysfunction
Sleep Apnea
Osteoarthritis
Increased Mortality
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Work upHistory
Amount of gained weight
Duration of weight gain
Recent changes in diet or appetite
Rate of weight gain
Rapid weight gain – fluid retention
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Work up (Cont’d)
History
Alcohol & Drugs Intake
Exercise Habit
Psychosocial Problems
Any other symptoms
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Examination
Height, weight, BMI, waist cm
Neck size, BP, PR
Features of Insulin resistance
Goitre
Liver edge
Oedema
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Laboratory tests
Glucose studies, lipids, renal & liver function
Sleep studies
Abdominal US, Echo
Secondary causes
Genetic cause/suspicion of?
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Waist CircumferenceMales – 102 (94) cm
Females – 88 (80) cm
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WEIGHT LOSS
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IntroductionAlways ask about weight change
Change of 5% over 6 months is significant
Relative change is also important
Significant weight loss – marker of serious illness
Persistence & periodic evaluation to identify the cause - important
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Mechanisms of weight loss
Increased energy expenditure
Increased energy loss
Decreased food intake
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Causes of weight lossI. Involuntary with increased appetite
A. Increased energy expenditure
Hyperthyroidism
Pheochromocytoma
Extensive exercise
B. Increased energy loss
Diabetes Mellitus
Malabsorption syndromesChronic pancreatitis
Ulcerative colitis
Chrohn’s disease
Celiac sprue
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Causes of weight loss (Cont’d)
II. Involuntary with decreased appetiteA. Medical disorders
CancerInfections: HIV, TB, Endocarditis, lung abscess, hepatitis, chronic helminthinfectionChronic illnesses
CHF, CLD, COPD, CKD
Endocrine diseasesAdrenal insufficiencyHypercalcemia
GI DiseasesPUDStricturesDysphagiaDiabetic gasteroparesisCompressive massInfiltrating cancer
Hyperemesis gravidarum
B. Psychiatric DisordersDepression
C. Chronic drug useAlcoholMetforminAnti cancersART
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Causes of weight loss (Cont’d)
III. Voluntary Weight Loss
• Diet and exercise
• Treatment of Obesity
• Anorexia Nervosa, Bulimia
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Evaluation
• Ask About Appetite
• Food Intake
• Weight History
• Maximum Weight
• Usual Weight
• Current Weight
• Patients Underestimate/Overestimate
• Ask Family Members
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Evaluation (cont’d)
• Voluntary or Involuntary
• Duration, rapidity & amount of Weight Loss
• Nutritional Status
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Evaluation (cont’d)
General AppearanceVital SignsHEENT :
Hair ChangesPallorMouth changes
GLANDS : Lymph NodesThyroid
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Evaluation (cont’d)
RESPIRATORY SYSTEM : CoughDyspneaChest Findings
CVS :DyspneaOrthopneaOedemaCardiac Findings
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Evaluation (cont’d)• GIS : Vomiting – Gastric Outlet Obstruction
DiarrheaMalabsorptionChronic Liver DiseaseOrganomegaly
• GUS : PolyuriaChronic Renal Failure
• CNS : ParaplegiaMalignancyMotor Neurone Disease
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DIAGNOSTIC WORK UP
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FIRST PHASE TESTS – For Every Patient
• CBC/ESR
• Urinalysis
• Blood Chemistry Tests
• Fasting blood sugar
• Calcium
• Urea & Creatinine – Chronic renal failure
• Liver function tests – Chronic liver disease
• Electrolytes
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FIRST PHASE TESTS – For Every Patient (Cont’d)
• TSH – Thyrotoxicosis
• HIV test
• Chest x- ray
• Stool for occult blood
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SECOND PHASE TESTS
• CT scans – Abdomen, chest, brain
• Mammography
• Parathyroid hormone level (if calcium level is elevated)
• Endoscopy
• Colonoscopy
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SECOND PHASE TESTS (Cont’d)
• Blood Cultures
• 72 h stool fat
• Bone marrow biopsy
• Vitamin B12 level
• MRI of the spine
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ConclusionGain & Loss in weight are important clinical problems
Involuntary change is a marker of serious underlying disease
Always ask about appetite
Obesity is a serious world wide problem with increased morbidity & mortality
Persistence and periodic evaluation is important to reach at the underlying cause for weight loss
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