Fat cells secrete the hormone leptin as a means of signaling the brain when we’re full after eating. But new research indicates that leptin may also play a role in motivating us to exercise as well—possibly contributing to the phenomenon of “runner’s high.”
We’ve known for a while that testosterone is associated with aggressive behavior. But a fascinating new experiment reveals that these hormones are a two-way street: Simply acting aggressive can also raise levels of testosterone, in both women and men.
Biologists already knew that one set of neurons play a big role in triggering puberty. A new study shows that these neurons don’t stop working once puberty ends, but keep running through adulthood, serving as a sort of reproductive timer.
Hormone surges at puberty trigger a lot of physical changes in both men and women, morphing child-bodies into adult forms. Genitals, hips, and muscle mass change, obviously–but so do faces. A new study suggests those facial changes are primed to happen by the presence of testosterone in utero.
A modern over-the-counter pregnancy test is a tiny engineering marvel, combining a sensitive antibody-based detection system with enzyme-activated dyes to pick up minute amounts of hormone from the developing placenta. Check out the new video that describes how it works at Ted-Ed!
“The Moral Molecule.” “The Cuddle Hormone.” If you’ve been paying attention the past few years, you’ve heard about many of the near-magical effects of the hormone oxytocin on the brain. It makes people more altruistic. It reduces anxiety and increases trust. But it’s not the only chemical that affects the brain that…
Male or female, most of us have body hair—some far, far more than others. This video explains how testosterone fuels the growth of hair all over your body.
You might have a friend who has to take them for asthma. You might know someone else who denies taking them but has gotten crazy ripped really fast and angers easily. Famous athletes are denying or being caught with them in their blood stream seemingly every day—just yesterday, MLB slugger Ryan Braun successfully…
The pill doesn't make you gain weight? The idea goes completely against what pretty much every woman in the world believes, myself included - until today.
What makes this slug so ninja-like? Because these slimy fellers shoot chalky "love darts" at potential mates which pierce and inject the proper hormones to make them hot and horny. Hmm..maybe it should be called the Roofie Slug, instead?