A lot of people go through weight-problems at some point of their life one way or another. Some after going through depression, some after break-up at relationships, some after pregnancy, some during old age etc. There is a book about a certain diet called the 17 Day Diet. According to a doctor from San Diego, you must change your food combinations and calorie count every 17 days for four consecutive cycles. This will keep the body to predict how much food it will need to process because it will have to keeps your metabolism consistently in its fat consuming state.
Here you will find best 17 day diet at http://www.nutritiongrid.com/17-day-diet/