Since you are asking how and not what to eat, I'll explain that concept here. Now, Understand that any change in weight is closely associated with your diet. Contrary to the popular belief eating junk food etc or anything and everything is not something which helps you gain weight in a healthy way. It may be a shortcut but is very harmful in the future. Although runners around the world eat anything, as their metabolism is so fast that they digest just about everything (the reason why they are so lean). If your physical activity is upto that level, you need to understand the maths below. Lets assume your calorie intake is x and calorie burn is y. To reduce your weight you need your x > y. Simple. When the body gets more calories than those you burn, it will start accumulating it in the areas which are least active. Hence to gain weight properly you will need to eat right and exercise right. Since I don�t have your proper details to suggest what all workouts suits you, I won�t be of much help there but I can surely help you with the means to achieve this. Now appetite has nothing to do with gaining calories. You only need to know the right food. Follow the following steps to gain appetite. a) Drink lots of water. b) Do not drink half an hour before or after your meal. c) Don�t take 3 meals a day. Take 8 meals a day. d) Do not eat to your heart�s content. Lets say you are hungry for 4 rotis, take only 3. This last one will boil your stomach again to eat some more in two hour or so. e) Take karela, aloevera, amla juice etc. Take any one of them, helps a lot in detoxifying the body. f) Start exercises. Contrary to the popular belief, exercises makes you gain weight as well, if done properly. g) Never sit down just after you eat. Roam around for a while to let your body extract all the nutrients from it. h) Start your day with a fruit salad. Helps a lot in gaining various nutrients, also increases appetite. Your food must be high on calories, you also need to take care of micro and macro nutrients. To achieve an overall good body. While following a diet your physical activity should be optimum so that neither you lose weight and neither it gets accumulated in just one place. I would like to suggest you to hire a nutritionist for the same. Options like Fitso, lybrate, healthyfyme can give you these at a much lower rate. I would recommend Fitso, since it has a calorie counter, apart from which they have home workout videos which you can follow (Only those where calorie burn is the least). You can also hire a fitness trainer, who will only provide you with strength training, so that the calorie burn is min. All these at one place. That is why I love their app. read less

Dairy products are the main key to increase the weight. After dinner have two classes of milk, add curd in your food, eat nuts after soaked in water in early morning, do exercise and have chickpea soaked in water and without cook. Do this routine atleast 4 months and you can see considerable change in your weight, read less

Hi, you should ingest more energy in form of more calories with good quality proteins and nutritious food on daily basis than you use up for physical activity. Add 500 calories per day to your current requirement. Eat more. Eat 5-6 meals per day. Avoid skipping any meal. Increase your portion. If you eat 2 chapattis, then have 3rd one. Eat corn,potatoes, peas,banana,custard apple,chikku,mango,peanut butter,cheese, milk with 2 tsp skimmed milk powder, boiled eggs. Maintain 2 hour gap between each meal. Drink plenty of water,juices,milk shakes,smoothies. Exercise daily. Exercise will stimulate your appetite,increase your energy needs and will convert extra calories into muscle. Sleeping is the best thing you could do to keep yourself healthy. Take afternoon nap immediately after lunch. Make sure you sleep for atleast 7-8 hours every day at night. Do let me know if you require customized diet plan for weight gain. Diet consultation and diet planning/chart consists of protein, carbs and fats in proportionate form to achieve your weight goals in healthy manner with follow ups. read less