I am prediabrtic and i wanted to no is coke zero bad for me. i usually drink something with caffeine in it cause i have adhd and it comes it down.

Sugar free okay: Diet drinks are not necessarily good for people in general but the sugar free kind are fine if you are going to use any.

It depends : Excessive consumption of caffeine is not good for adhd and general health. People who take a lot of caffeine to stay alert or focused need medical attention. 2 servings of caffeine per day before 2 pm is ok for most people. Coffee or tea are better than soda beverages.