Can it take time for testosterone to increase if you've changed your diet with no sugar?

Yes but only if . . : Diabetes & obesity is linked to lower testosterone levels so if you can address those issues by avoiding sugar, then you might see an increase in t in a few months. Don't forget that avoiding sugar isn't enough as many high glycemic foods are easily converted into sugar. Also, your health & quality of life is more important than a number. Improve your diet & exercise regularly to improve health...