U should eat frequently even if small amount. U can do following--
1. Exercise in the form of yoga
, cycling, Swimming, gymming, walking etc.
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, spicy n fried foods
7.Take a lot of green vegetables n fruit. It contains a lot of fiber which will help reduce tendency for constipation
8. Drink lot of water.
For more details you can consult me.