Originally Posted by Darkland

Apparently you have never heard of the thyroid gland and the complications it causes when malfunctioning. The thyroid, you know, controls the metabolism your talking about. It also is important in producing key hormones that regulate that metabolism. Metabolism determines the rate at which a person can burn calories and thus has the ultimate effect on one?s weight.

There are several other medical conditions and diseases that can effect weight gains that are NOT related to over eating, lack of exercise, etc.

If you know so much about physics that you think you do, you would know it is merely a model with set rules and equations to determine properties, interactions, processes, and known laws. Information and data OTHER than the standard laws must be taken into account as well. What you fail to realize within your "ideal" or "perfect model" of physics, as already stated by another member, is that the human body doesn't always respond or work in the manner it should.

Take cancer for example, it starts it's life out as healthy cells or tissue that is triggered by a gene causing it to grossly and dangerously multiply and mutate. In your "ideal" or "perfect model" of physics, even though it is really about biology, those cells shouldn't mutate. But they do, just as some obese people are that way for reasons OTHER that not taking care of themselves.

Otherwise, in a perfectly healthy person, what you say is true.