You want to gain your weight that you eat a healthy food like a bread,butter,cheese,cake,take a fruit,juice,and a vegetables and this are the best for our body take it you gain your weight.

Don't say I want weight, say I want to be healthy & for this you should
1. Take the nutrient as your food.
2. Do regular exercise.
3. Always be happy.
4. Avoid junk or cold drinks food.

Maybe you should get some rest, to eat healty home food take a break from your PC.

For gaining weight, you should develop the habit of eating more than your calories requirements (You should calculate your BMR and equate your calorie need). Plan your weekly diet with an intake of 3500 calories to gain 1 to 2 pounds a week. Make sure that you eat foods that are rich in proteins. Beef, chicken, milk, etc are very important. You should remember hat your meals contain plenty of vegetables too.

You have to follow a “weight gain and muscle mass building” routine. Your activities should make you gain weight without ending up obese.

clarianhealth.org