Ever wonder why you feel like crying over a pet food commercial one day but can watch a tearjerker movie completely unfazed the next? Or why your weight seems to fluctuate despite eating the same ...

Metabolism and thyroid hormones: a close relationship. Because they have such a big impact on how your body uses energy, thyroid hormones are often called the metabolic regulators. Your body burns ...

Hormone levels fluctuate like the tides, ebbing and flowing according to carefully orchestrated cycles. These hormones not only influence the body, but can cross into the brain and shape the behavior ...

Reviewed by Felix Gussone, MD. Your endocrine system is a network of glands that produce and release hormones directly into your bloodstream. These hormones act like tiny, powerful messengers, ...

Hormones control all bodily processes in humans because they affect everything from metabolism and mood through reproduction and sleep. However, one of the most important yet often misunderstood ...

Sunlight activates hormones essential for mood, sleep and reproductive health — that’s why it’s important to go outside when ...

Endocrine glands secrete hormones into the bloodstream, while exocrine glands secrete substances, such as sweat or enzymes, into organs or onto the surface of the body. The two main types of glands in ...

Free-living great tits differ considerably in the level of stress hormones in their blood. A research project at the Max Planck Institute for Biological Intelligence (in foundation) studied the birds ...