Progress in Science?

While the laws of thermodynamics still apply to energy balance in humans, we have learned more over the past 20 years about the many factors that affect energy balance.

Readers who were fitness professionals in the 1980s probably learned that weight control was a simple matter of thermodynamics. People consume energy in food. They use calories through resting metabolism, digestion and physical activity. One pound of body fat is worth about 3,500 calories. Create a 3,500-calorie deficit by decreasing energy intake and increasing energy expenditure, and 1 pound of fat should be lost. Simple, right?

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