Less than 19: you are underweight, and may not be taking in enough nutrients. Malnourishment can lead to depression, anemia, lowered resistance to infections, flu and stress, and chronic fatigue. Very low calorie diets can lead to eating disorders in some people.

19-25: a healthy weight range for most people.

25-27: acceptable, but be cautious as the potential for health problems increase in this range.

More than 27: you risk obesity and associated health risks such as high blood pressure, diabetes, heart disease, certain cancers, arthritis and poor mental health. Drug therapy may be indicated along with sound nutrition and regular exercise.