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Dear Customer
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Regarding your question

What are the methods for gaining weight?

1.Eat More. Eat more calories than your body burns
2.Eat More Protein
3.Try eating snacks between meals
4.Take multivitamin like CENTRUM once daily
5.Heavy training increase the muscle mass
6.Take appetite enhancment 

What are the causes for being underweight?

1. Genetics
2.High metabolism
3.Drug use
4.Lack of food intake
5.Eating disorder or illness (both physical and mental)
6.Medical conditions including diabetes,hyperthyroidism, cancer, or tuberculosis.

What are the investigations for weight gaining?

1.Clinical assessment at the nearest medical center
2.Complete Blood Count
3.Glandular function tests
4.Thyroid function tests
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