We have trillions of body clocks — a central one in the brain and others in each cell of our body. Here's how they work with light to control our health. When you purchase through links on our site, ...

Runners hear the terms aerobic and anaerobic thrown around, but understanding the difference between the two can change how you approach your workouts. Together, these energy systems form the backbone ...

Most people think of weight loss as a math problem: calories in versus calories out. In reality, your body sees it as a survival threat. When calorie intake falls or body fat decreases, biological ...

For many people, body image isn’t just one part of their identity—it becomes the piece that feels most tied to how they’re seen, how they see themselves, and whether or not they’re “enough.” This ...