The bad cholesterol that causes heart problems can be burnt or removed if onions are consumed daily. It keeps you stay safe from the coronary diseases and also protects the good cholesterol. onions have shown potential for improvement of blood sugar balance, even though it is not yet clear about the carry over of these benefits for humans who are seeking better blood sugar balance from their diet. Most of the animal studies have been conducted on rats, and most have used onion juice or onion extract as the form of onion tested. Future research is needed to clarify onions potential for helping lower blood sugar and improving blood sugar control, especially in persons with blood sugar problems.