Alternative day fasting... can help

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I'm thinking of giving this fasting carryon a go. My thinking is I could go every other day without eating my question is could I drink Coke Zero and coffee on the fasting days or is it only water? Any help would be greatly received

Title should read 'can you help' sorry

I follow a ‘clean’ fasting approach.

So just black coffee,black tea or water.

Diet drinks can cause a spike in insulin in some people which makes fasting a lot harder.