Hi,
In Ayurveda you can put on weight with no side effects. Instead you will get some extra benefits too.
1. Full body massage using Tila taila (gingelly oil) or any other rejuvenating oils for at least 10 minutes daily.
2. If you are suffering from any other disorders like
diabetes,
thyroid dysfunction,
indigestion,
sleeplessness get it cured first.
3. If your digestion power is good, take cow's ghee and cow's milk daily.
4. Vegetables like pumpkin, snake gourd, ridge gourd are helpful. Add fruits in your diet.
5.
Panchakarma therapies followed by Rasayana medicines have to be taken by consulting an Ayurvedic physician.
6. But, first of all, a healthy life style is very much necessary. No junk foods, fast food, preserved/ready made foods. No skipping of meals and taking food at irregular timings.
Home made sweets, ghee, milk, honey, sugar cane juice and its bi-products are recommended.
Take care