Brief Answer:
to gain weight you need to consume more calories.

Detailed Answer:
Hi,
Welcome to health care magic,

I have read your query and understand the concern.

Since you are 27 years having 49 kg weight which might be less but it should be counted or considered in proportion to your height. So please mention your height.

However in order to gain weight, you need to consume more calories every day from healthy foods and choose the right type of exercise.

You can have below mentioned diet along with supplements to gain some weight.

Eat high calorie, high protein diet but at the same time do not increase the intake of junk foods and greasy foods.

Eat healthy fats like omega-3 essential fatty acids sources like salmon, walnuts. They are actually PUFAs (poly unsaturated fatty acids) and essential fatty acids, which means they cannot be synthesized by the body and have to be included in the diet. The best sources of omega 3 fatty acids are fish like salmon and for a vegetarians, the best sources would be seeds (like flaxseed, soybean, pumpkins and walnuts).

Eat high protein rich foods like egg white nuts, seeds, pulses,fish and legumes.

Eat healthy carbohydrates like fruits, vegetables and whole grains.

Protein powder with nutritional supplement can be taken (like Nutrilite protein powder or ensure plus powder manufactured by Abbott Laboratories),it helps in gaining muscle mass. But doing exercises along with it would be advised.

Drink a lot of fluids that supply nutrients and calories like milk, fresh fruit juice and energy drinks.

Drink at least 2 glasses of milk, replace tea with milk.

Have eggs for breakfast. Custard is good for putting on weight. Drink banana and sapota milkshakes.

Exercises are also important for healthy weight gain.

Hope this detailed information is helpful and get back to me with your height.

Regards,

Dr.Sandip kabra

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