Keto is a low-carb plan, which can help you lower your blood sugar levels. One study found that after six months on a keto diet, people were able to significantly cut back on their insulin medication. And any diet that helps you lose pounds is also good for diabetes, since being overweight is a major factor in the disease. NK is when the body shifts to using fat instead of glucose for energy, such as after a prolonged fast. The liver converts fat into ketones which can be used by the brain for energy.