How do i increase my weight ?, I'm 24yrs, 53kgs.?!

Best Answer - Chosen by Voters

If you want to put on weight, you should work out, to insure that you
put on muscle and not fat. Healthy weight gain, just like healthy
weight loss, takes time and
requires a conscious effort to apply good habits.
Recommended Ways to Gain Weight
Have meals with the right balance of proteins, carbohydrates, and the
right kinds of fat (such as unsaturated and monounsaturated fats,
olive oil, canola oil, pistachios, almonds and walnuts). Heinemann
suggests the following ratio: 60%-70% carbohydrates, 10%-15% protein,
and a small amount of fat.
Eat foods higher in calories, vitamins, and minerals, as opposed to
higher in fat or sugar.
Pack more nutritious calories in each serving. For example, you may
add grated cooked eggs to mashed potatoes, ground chicken to soups and
gravies, cheese in casseroles, eggs, and soups, and nonfat dried milk
in soups, shakes, milk, and mashed potatoes.
If you get too full too fast, try having more high-calorie foods or
slices of foods as opposed to consuming the whole thing (raisins
versus grapes, granola and Grape Nuts versus corn flakes, mango slices
versus the whole mango).
Limit drinking beverages to a half-hour before and after a meal.
Drink mixed juices (apple/berry, peach/orange/banana as opposed to
one juice beverages) for a higher calorie intake.
With moderation, you may add in good fat sources to meals such as
nuts, avocado, olives, and fatty fish (salmon and mackerel).
Snack in between meals. Nuts, dried fruits, and yogurt are good
options, but it's also important to find nutritious foods that you
will enjoy.
Have a nutritious snack before bedtime, such as a peanut butter
sandwich.

This is a strange question as most people want to lose weight and not gain it. First you need to make sure that you actually have to put on weight and the only reason for this is because you're underweight. This means that your body mass index is below 19.
Now there could be other reasons for you for wanting to gain weight, one of them would be for a role in a movie.
The easiest way to increase your weight is to eat a lot of fatty foods and drink a lot of alcohol. But as you may guess, it's not very healthy ! The healthy way to do it is to eat plenty of fruit, vegetables, carbohydrates, meat, chicken, fish, seafood and full-cream dairy products.