the question is how else has your eating changed? if your low sugar and no wheat diet also includes more fruits and vegetables and other sources of fiber like beans then you have your reason (fiber makes food go through the intestine faster). i don't think just removing sugar and wheat would cause you to go to the bathroom more but its likely due to any other changes you are making. if you feel the changes are a problem see your healthcare provider.
i have started a low-sugar and low-wheat diet and i keep going to the toilet more than normal. is my diet the reason?