Andrew Huberman· PhD
And for those of you that don't know why your stomach growls, I'll also tell you that today. It's actually really interesting. It not at all what you expect, and it's not just the gurgling of liquids in your stomach. That's not what it is. It's actually a muscular phenomenon. So, ghrelin is secreted as a food anticipatory signal, to get you motivated to go eat at regular times.