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Evidence suggests that the "satiation signal" may not work well in people who are considerably overweight. In other words, during a meal, they don't develop the feeling "I've had enough to eat" early enough. This can lead to overeating and weight gain.

Low levels of physical activity can also lead to weight gain. If you don't burn off the calories you consume through your normal daily activities, they will be stored in your body as fat.

The good news is that even moderate amounts of non-strenuous activity can reduce the risk of developing many serious diseases.

In addition to overeating and lack of physical activity, genetics, heredity, environment and socio-economics can all increase a person's risk of becoming considerably overweight.

Who Suffers from This Condition?

Excess weight is a problem facing an estimated 97 million adults in the U.S. Currently, about one-fifth of all U.S. adults are believed to be considerably overweight.

Although people of all ages, races and ethnicity can become overweight, there are some people who are at greater risk than others.

For example, women are more likely to become considerably overweight than are men, particularly in certain ethnic groups such as African-Americans and Mexican-Americans.

Does This Condition Lead to Other Serious Health Problems?

Excess weight has been proven to contribute to an increased risk of developing many medical problems, including high blood pressure, high cholesterol, heart disease, type 2 diabetes, breathing problems, sleep disorders, common arthritis and some forms of cancer.

Research shows that 70% of people who are considerably overweight develop at least one other related health problem.