Proteins are necessary for tissue repair and for the construction of new tissue. Every cell needs protein to maintain its life. Protein is also the primary substance used to replace worn out or dead cells. Your muscles, hair, nails, skin, and eyes are made of protein.
Taking supplemental chromium has been shown repeatedly to improve insulin sensitivity and glucose tolerance, even to the point of reversing type II diabetes in many people (1). Thus, as my old clinical nutrition professor pointed out, apparently a chromium deficiency can actually lead to type II diabetes.
People with fatty liver disease are often insulin resistant. Their bodies make insulin, but it doesn't work well. Glucose builds up in the blood, and the liver turns that extra sugar into fat. Certain fats in your diet can improve your sensitivity to, or ability to use, insulin.