You need to adopt a healthy n active life style
Do the following
1. Eat something like a banana
(if you are not diabetic) or soaked almonds
and a glass of water first thing in the morning (within 10 mins of waking up). 2. Take your breakfast every day. Don't skip it.
3. Have light meals every 2 hours (in addition to your breakfast, lunch n dinner) e.g. Nariyal paani, chaach, a handful of dry fruits, a handful of peanuts
, seasonal fruit, a cup of curd/milk etc
4. Finish your dinner at least 2 hours before going to sleep.
5. Maintain active life style
6. Avoid fast foods n fried foods
7.Take a lot of green vegetables n fruit. 8. Drink lot of water
Now about point no. 5. You should join a gym for weight training. Do it 2-3 times a week with atleast 48 hours inbetwen 2 sessions
For more details you can consult me.