In my view, guys who are overweight would be ill-advised to hide from the sun to lose weight. From their paper: "Our study revealed that UVB exposure enhances

In my view, guys who are overweight would be ill-advised to hide from the sun to lose weight. From their paper: "Our study revealed that UVB exposure enhances food-seeking behavior in males via ghrelin and a process that is prevented in females. ... UV is a well-established carcinogen, but avoiding the sun rays adversely impacts human health, too. Since ghrelin has anti-inflammatory properties, halts heart muscle wasting and decreases arterial pressure, ghrelin may be the mechanistic link between solar exposure and cardiovascular disease reduction. Moreover, ghrelin enhances insulin sensitivity in metabolic syndrome patients and in animal models of type II diabetes. ... In addition to its function in regulating energy homeostasis and the functions mentioned above, ghrelin also mediates glucose homeostasis, muscular atrophy, bone metabolism, stress and anxiety, adipogenesis and the immune system."