How does chromium help my blood sugar?

Chromium is an… …essential trace mineral that has the ability to increase Insulin sensitivity in diabetics & pre-diabetics (impaired glucose tolerance). As a metal, there is a risk of toxicity when taken as a supplement. Most sources advise getting needed chromium from food—whole grain breads & cereals, lean meats, cheeses, black pepper, thyme, brewer's yeast, onions, tomatoes, potatoes, oysters.