The guidelines rely on the assumptions that all calories are the same. Therefore is makes no difference what you eat. If you eat too much you'll put on weight unless you exercise enough to burn off any excess calories.
In this theory 9000 kcal, is equivalent to 1kg of body weight. Much is made of the fact that 1gm of fat contains 9 calories, while 1gm of carbohydrate contains only 4 calories.
In reality, if people eat excessively, they put on less weight than the calculation would predict. Homeostasis tries to protect the body weight you have, and metabolism rises to burn off excess energy (as heat).
In contrast, if people eat less, they lose less weight than the calculation would predict. Homeostasis tries to protect the body weight you have and your metabolism rate falls to conserve energy.
How to be Slim and Active
Follow the Recommended Dietary Guidelines
Green top milk, low fat with, and high carbohydrates and lots of vegetables.
Exercise more. (Increases your appetite: fails)
The Dietary Guidelines are Wrong
If people eat more fat, they feel satisfied and so they naturally eat fewer calories. On a high fat diet, you never feel hungry.
If people eat more carbohydrates they get sugar highs and lows. As the sugar level falls they "feel hungry" and choose to eat again. Hence they tend to eat more.
If you rely on carbohydrates for your energy you always seem to be hungry. You end up eating every 2-3 hours. Therefore, insulin is on all day, and you are potentially storing fat all day. If you over-eat you will generate more adipose tissue.
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