Wednesday, January 6, 2010
The physiological process
Obesity often results from an imbalance between:
Daily energy intake (or EAT: total energy intake, amount of calories) made by food.
No carbohydrates (sugars slow or rapid GI more or less): sucrose, glucose, fructose, etc..
lipids (fatty acids) found in vegetable oils and animal fats in particular; and proteins, vegetable (seaweed, lentils, for example) or animals (meat, fish).
And the total energy expenditure:
No heat exchange with the environment (thermoregulation), even more important than the outside temperature is low;
No power needed to run the body (eg digestion.). The brain alone consumes about 20% of the total energy;
No physical exertion: walking, sports, physical activities of any kind.
When the body receives more than it spends, it stores a part of the contribution in the form of fat in adipose tissue. However, the metabolism, vary greatly among individuals, plays an important role, and some people will more easily become obese than others (including genetic factors).