With a balanced diet, a deficiency of chromium is rather unlikely. Only artificial nutrition over a longer period of time can possibly lead to it. Symptoms such as increased blood lipid levels, increased urination, weight loss, poor concentration, itching, muscle weakness and nervousness could occur. Due to the fact that chromium is found in many animal foods, vegans should make sure to eat legumes and nuts to counteract chromium deficiency. (WebMD)