Onions, leeks, garlic and other Allium species synthesize cysteine sulphoxide derivatives
(allyl sulphur compounds) as a mechanism of protection against attack by pests. When the plant cells are damaged, the enzyme alliinase is released. It catalyses a series of reactions to form thiosulphinates, and a variety of organic mono-, di- and trisulphates and thiols. In onions the major product is thiopropanal-S-oxide, a potent lachrymator.
They also cause increased clearance of potential carcinogens and metabolites, by induction of glutathione S-transferases.
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All you need is a proper diet of fresh fruits and vegetables and get plenty of exercise and you'll be fine. Ever heard those words from your doctor? If that's all heshe recommends then you're missing out an important ingredient for health that he's not telling you. Fact is that you can adhere to the strictest diet, watch everything you eat and get the exercise of amarathon runner and still come down with diabetic complications. Diet, exercise and standard drug treatments simply aren't enough to help keep your diabetes under control.