A male’s total testosterone level may be linked to more than just sexual health and muscle mass preservation, a new study finds. Low amounts of the hormone could also be associated with chronic disease, even among men 40 years of age and younger.

An epidemiological study conducted by researchers at University of California San Diego School of Medicine and Seoul National University suggests that persons deficient in vitamin D may be at much greater risk of developing diabetes.

Increased awareness of the health consequences of eating too much sugar has fueled a dramatic uptick in the consumption of zero-calorie artificial sweeteners in recent decades. However, new research finds sugar replacements can also cause health changes that are linked with diabetes and obesity, suggesting that switching from regular to diet soda may be a case of ‘out of the frying pan, into the fire.’

Older people should drink more water to reap the full cognitive benefits of exercise, new research suggests.

Testicular cancer is the most common form of cancer in men ages 15 to 35. It grows in the tissues of one or both testes—glands that are located in the scrotum. Most cases of testicular cancer start out in the sperm-making cells known as germ cells. Testicular cancer can be classified into seminoma and nonseminoma. Although aggressive, both cancer types are curable even when metastatic.

It is most common in people 60 and older, but low vision can affect anyone at any age.