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| Causes & Development Being underweight can be caused by heredity, a serious illness, not eating enough, or a combination of intense ongoing exercise and insufficient calories in the diet. Commonly it is caused by an eating disorder such as anorexia or bulimia. Severe depression can also affect the appetite, resulting in underconsumption and weight loss. Treatment & Prevention Increasing calories may be recommended for persons who are underweight, athletes who want to gain weight to enhance performance or those whose calorie needs are increased due to a poor health condition. |
| Problems Caused By Being Underweight |