In the past, the first law of thermodynamics was often used to explain the control of body weight. Simply put, if energy intake (food) exceeds energy expenditures (exercise/activity), then weight gain occurs. Conversely, reducing intake and increasing expenditures was believed to be the key to weight loss. For years, doctors and researchers believed this simple theory to be the answer. We now know, however, that other factors are involved. Some people can exercise religiously, reduce food intake and still not lose weight. And, of course, we all know people who can eat whatever they want and never gain a pound.

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Obesity definition is very straightforward. Obesity is simply defined as a condition of being overweight. It means that excessive amounts of fat are accumulated in your body, which results in the excess body weight. A healthy person’s weight must be in proportion with his or her height, which means within the body mass index (BMI). The ideal BMI is within 18.5 to 24.9. So, in clinical terms Body mass index of 30 and above is defined as obesity.

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