Hi,
You need to increase the quantity of your food intake little by little.Choose 'nutrient dense' foods instead of 'high calorie' junk food. You can also start with some simple exercises and weights to increase your appetite and strength. We have a sample diet on our website for underweight kids,please go through it to understand how to eat better:
http://www.desidieter.com/diet-for-underweight-kids.html
All the best!
Staying Healthy Was Never so Easy!
Wishing you Good Health and a Good Life!
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