Question

1. Explain the factors that may contribute to a weight problem or excess body fat in the following categories:
   1. genetic,
   2. physiological,
   3. lifestyle factors.

Answer 1

Answer.

1. Genetic factors- body fat

-25-40% of an individuals body fat
- more than 600 genes linked to obesity
- influence body size, shape distribution, metabolism.

2. Life style factors- body fat

A. Eating:
- People underestimate portion sizes by 25%
- calorie intake increased by 18% since 1983

B. physical activity:
- 60% of incidents of overwieght due to TV
- exercise 15 a day and TV 170 minutes a day

C. psychosocial factors:
- Binge eat: relieves stress, boredom, cope.

3. Physiological factors- body fat

Metabolism & energy balance:
- RMR accounts for 65-70% daily energy expenditure
-digest food: 10%
- physical activity 20-30%

Hormones:
-women: pueberty, pregnancy, menopause
-leptin: lets brain know how big/small the body's fat stores are.