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You should include foods like flour, rice ,honey, raisins, figs, dates, butter, cheese,bananas,milk etc.in your routine diet. Sweat substances can increase weight more than fatty foods. Germinated wheat is also beneficial if taken in the form of gruel mixed with hot milk.Jaggery mixed with curd in equal quantity to be taken twice a day empty stomach definitely puts on weight.Apart from this you can have some Ayurvedic preparation of Ashwagandha
Dr. Tanju khurana
Ayurvedic Doctor and Nutritionist