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Alternate day fasting originated in the US before the fast diet became popular in the UK. The principles of this diet are very simple. A strict fast diet is followed every other day. It also restricts how many meals you eat in that one day. The 5:2 diet is a variation on this theme, allowing you to fast for fewer days in a week and also to take weekends off. They are similar in terms of weight loss and effects, although obviously you may lose weight faster on ADF. But the success rate (i.e. the number of people who stick to the diet in the long term) is lower.

There has been an interesting study in the US by Dr Varady into ADF. Varady’s research is fascinating. She took a group of both male and female overweight volunteers and started them on ADF for a year. This study is still progressing, but initial results in this case show a low dropout rate, gradual and continued weight loss and falls in both total and LDL (‘bad’) cholesterol.