There is much controversy surrounding the use of MSG. Even though it is still regarded as safe by the FDA, there are health risks involved. When tested on mice, they were found to have higher risks of obesity, brain lesions, stunted bone growth, and sterilization. The health issues were more serious when MSG was presented earlier in life. The mice that developed obesity from MSG were also at a higher risk of diabetes and insulin resistance. These results also seem to correlate to observed humans who have been known to eat higher amounts of MSG.