Developed by Harvey and Marilyn Diamond, the fit for life book details a food combining program that can help you to lose weight.

The food combing that the Diamonds present in their fit for life books is not a new one, but they present it in a clear and accessible way, making it easy for people for follow.

The fit for life book divides opinion. On the one hand, many scientists state that there is no evidence to suggest that the food combing theory has any validity - on the other hand, there are thousands of people who have used this diet to lose weight.

So where does the truth lie? Probably somewhere in between - for example if you are used to eating a big breakfast, then following the plan's suggestion of only eating fruit before mid-day is likely to reduce your calories, and thus help you to lose weight.

The best approach is to check it out for yourself. Following their plan is unlikely to cause any problems - for example, they recommend eating lots of fresh fruit and vegetables, which is good for anyone. Who knows, this might just be the plan that works for you.