Can I drink diet coke?

No you cant drink it, it has citric acid which can knock you out of ketosis.

Coke Zero and Asdas own brand Diet Coke are ok though :)
 
Im not entirely convinced its true that diet coke will take you out of ketosis. This came about through children on ketogenic diets (to control epilepsy) being advised not to drink diet sodas because of the citric acid in them. If you are already in ketosis and you just have a couple then im pretty sure it wont hurt, unless you are sensitive to citric acid. The best way to find out is test before you have one and test a couple hours after. Diet coke has never taken me out of ketosis. Some people drink litres of the stuff every day though, and they may find that getting into ketosis is problematic.
 
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