The 5:2 diet sees you eat normally for five days and fast for two days and is believed to be a simple way of losing weight. Celebrity supporters include Phillip Schofield and Hugh Fearnley Whittingstall.
Fans claim it can improve lifespan, brain function and protect against conditions such as dementia and Alzheimer’s.
Pros: People only need to stick to a diet regime two days a week and are more likely to persevere and successfully lose weight.
Cons: On non-diet days you cannot eat more than usual and skipping meals can make you dizzy, irritable, give you headaches and make it hard to concentrate.