Hi doctor before my body weight is 79 but now...

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What are the causes?

1. Smoking
2. Depression
3. Malnutrition
4. Bacterial or viral infection
5. Chronic diarrhea
6. Decreased absorption 
7. Some medications like laxatives
8. Anorexia
9. Hyperthyroidism
10. Diabetes

What are the required investigations?

1. Physical examination
2. Blood test (cbc)
3. Thyroid function tests
4. Diabetes tests
5. Endoscopy

What is the treatment?

1. Healthy food
2. Regular exercise
3. Stop smoking
4. Multivitamins
5. Treatment of the cause 

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Kind Regards