““have been associated with obesity, depression, cognitive impairment, heart disease, reduced immunity, cancer, psychosis, and all causes of mortality. Check your 25-hydroxy vitamin D level, and if it is low, try to get more sunshine in a safe way and/or take a vitamin D3 supplement. A healthy vitamin D level is between 75 and 250 nmol/L (nanograms per liter). Optimal is between 125 and 250 nmol/L. Personally, I never wanted to be in the bottom of any class I was ever in. Two-thirds of the population are low in vitamin D; this is the same percentage of U.S. residents who are overweight or obese. According to one study, when vitamin D is low the hormone leptin that tells us to stop eating is not effective. One””