White rice undergoes a lot of processing and polishing which removes majority of its nutritional value and instead makes it harmful for consumption. Look at the figure for the comparison.
White Rice leads to Diabetes
“Higher consumption of white rice is associated with a significantly increased risk of Type 2 diabetes, especially in Asian (China and Japan) populations,” wrote the authors from the Harvard School of Public Health, Boston. White rice primarily contains starch, as the polishing removes most of the nutrients found in the bran such as insoluble fibre, magnesium, vitamins, and lignans (a group of chemical compounds acting as antioxidants). Insoluble fibre and magnesium, for instance, have been found to lower the risk of Type II diabetes. Unlike brown rice, polished rice has a high glycaemic index (an indicator of glucose-raising effect of a food) and is a major contributor of dietary glycaemic load. Higher dietary glycaemic load is generally associated with the increased risk of diabetes. Hence, the harmful effects of polishing are two-pronged — it removes the nutrients that would cut the risk of diabetes and at the same time pushes up the glycaemic index, thus increasing the risk of the disease. [ Source ]So, do you like your rice white or brown?