Insulin moves potassium into the cells, reducing the levels of potassium in the blood and potentially causing hypokalemia. If someone has received more insulin than normal, they should increase their potassium intake. Foods with sugars may be limited but should not be avoided entirely. Keeping track of carbohydrate intake, not fat intake, is recommended for those with diabetes. Green vegetables are high in vitamin K, and while they may affect those taking warfarin, it will not change any of the medications used to treat diabetes.