ANS, autonomic nervous system-the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands.
Underweight: Your BMI is less than 18.5. Healthy weight: Your BMI is 18.5 to 24.9. Overweight: Your BMI is 25 to 29.9. Obese: Your BMI is 30 or higher. The chart below shows examples of body mass indexes. The figure at which your height corresponds with your weight is your body mass index. To find yours, consult the chart, or use WebMD's BMI calculator.
Body mass index, or BMI, measures the relationship between height and weight. It's a way to evaluate whether a person is of normal weight, overweight or underweight. Healthy adults usually fall between 18.5 and 24.9 on the BMI chart. A BMI below 18.5 signals a problem may exist, while a BMI below 17.5 -- especially in adults -- is usually present in people suffering from anorexia nervosa.