26 Times You Should Say 'No Thanks' to the Keto Diet
3. If You Have Diabetes

Fiber is needed to slow down the digestive process, which has an impact on blood glucose spikes. Fiber is only found in plant sources of food and is limited while on the ketogenic diet. Fiber controls blood sugar levels by limiting the amount of glucose that is dumped into the bloodstream. Because of this, fiber reduces blood sugar spikes and can help control diabetes. Eating a diet that is high in vegetables is the best way to incorporate fiber into one's diet. This would be hard to accomplish on a diet that limits its overall carbohydrate intake to just two to four percent.