Our expert says:
The celebrity diets ban alcohol because 1 g provides 29 kJ (second only to fat which contains 37 kJ), but why they ban coffee is a mystery because black coffee on its own contains zero kJ. You can certainly have your cup of black coffee every morning when you are on diet. I don't know which one of the celeb diets you are contemplating, but be careful because most of them are highly unbalanced. You may lose plenty of weight with celeb diets, but you will probably regain all the weight you have lost when you revert to normal eating.
Good luck with the ambitious plan
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