Diet<unk>  individuals may be advised to gain weight by increasing calorie intake. This can be done by eating a sufficient volume of sufficiently calorie-dense foods. Body weight may also be increased through the consumption of liquid nutritional supplements. Exercise Another way for<unk>  people to gain weight is by exercising, since muscle hypertrophy increases body mass. Weight lifting exercises are effective in helping to improve muscle tone as well as helping with weight gain. Weight lifting has also been shown to improve bone mineral density, which<unk>  people are more likely to lack. Exercise is catabolic, which results in a brief reduction in mass. However, during recovery, anabolic overcompensation causes muscle hypertrophy, which results in an overall increase in mass. This can happen through an increase in muscle proteins, or through enhanced storage of glycogen in muscles. Exercise can also help stimulate the appetite of a person who is not inclined to eat. Appetite stimulants Certain drugs may increase appetite either as their primary effect or as a side effect. Antidepressants, such as mirtazapine or amitriptyline, and antipsychotics, particularly chlorpromazine and haloperidol, as well as tetrahydrocannabinol (found in cannabis), all present an increase in appetite as a side effect. In states where it is approved, medicinal cannabis may be prescribed for severe appetite loss, such as that caused by cancer, AIDS, or severe levels of persistent anxiety. Other drugs or supplements which may increase appetite include antihistamines (such as diphenhydramine, promethazine or cyproheptadine).
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