The Worst Foods for Your Teeth and Diabetes What we consume daily for food and drink has an immense effect on our bodies. As a benefit, food gives us nutrients and energy to help our bodies get through our daily lives. But the opposite is also true. Food and drinks that are bad for us can negatively impact our whole health, including our bodies, heart, liver and more. It’s even true for our mouths. We largely know about food that’s bad for your teeth and gums. And we largely know about the food and drinks that affect your blood glucose management. But which food and drinks are bad for both? We tried to break it down and identify some of the eats that may be harmful to your mouth – especially if you’re at risk for diabetes.