The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Now, VEGF will be secreted out of the muscle and diffuse or just leak out into the lining of blood vessels. Now, the lining of the blood vessels is made of cells called endothelial cells which pick up the signal, they have little receptors that sense VEGF. And when they get that signal that says, "Oh wow, we're being chased by a saber tooth tiger for the last week, we better build more blood vessels," and they do that.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
Normally, if you have a tube which is a capillary, almost microscopic blood vessels, what happens is the endothelial cells will start to branch out to the side and make a new blood vessel. And that's what you get with exercise. Conversely, if you sit around all day, you won't build new blood vessels, you'll actually have fewer and fewer and your muscle and your brain starts to get starved of oxygen. Now, one of the big problems we discovered is during aging, that signaling pathway, that signaling mechanism is defective. And even though you're exercising as you get older, you're not getting the benefits of it; you don't get the new blood vessels.