It sounds too good to be true. A five-day diet that promises not only a slimmer body, but also the tantalising possibility of a longer lifespan, improved heart health and reduced inflammation.

The accompanying guide suggests adopting a sensible eating plan based on drinking up to 3 pints of water per day, eating more fresh fruit and avoiding foods like red meat, cola and chocolate.

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The five-day diet ranges from consuming 1,100 calories on day one to 800 calories on days two to five It sounds too good to be true. A five-day diet that promises not only a slimmer body ...