High blood sugar levels and diabetes have also been linked to micronutrient deficiencies. Examples include deficiencies in the minerals chromium and magnesium. Chromium is involved in carb and fat metabolism. It also helps regulate blood sugar levels. A lack of chromium may predispose you to carb intolerance. Chromium-rich foods include- meats, whole grain products, fruit and magnesium rich food includes spinach, kale, pumpkin seeds, almonds.