Poor sleep and memory changes often show up together. New research suggests one familiar vitamin may matter more than expected during this early window of cognitive change — but the dose linked to the strongest result may surprise you.

For decades, you probably chose low-fat milk and yogurt to protect your weight and cholesterol. But when researchers had people eat three servings of full-fat dairy every day, what happened wasn’t what conventional wisdom would predict…

Belly fat becomes increasingly common as we age. But researchers have discovered something that could make it far more dangerous: having too little of one important vitamin at the same time.

Chronic pain can rob you of sleep — and poor sleep can make pain feel even worse. Researchers say a familiar bedtime supplement may have an unexpected advantage: It appears to target both sides of that vicious cycle.

Pancreatic ductal adenocarcinoma is on the fast track to becoming the second-leading cause of cancer-related deaths. Why? A common denominator in two common conditions turns cells cancerous, but there’s a way to throw a kink into the equation…

Think summer sunshine is enough to rebuild your vitamin D stores? New research suggests that for many people the “sunshine vitamin” may stay low all year long. And that could matter more with every passing birthday.