Later on, the diet also allows for red wine, dark chocolate and chilli as key items.

Adele’s personal trainer Camila Goodis described the first week as “intense”.

She said: “The first week is intense, green juices and only 1,000 calories. She doesn’t look too thin – she looks amazing.”

The singer is also reported to be taking fitness tips from the same expert who helps keep Rihanna and Lady Gaga in shape.

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