> Ghrelin has been shown to have wide-ranging biological effects in areas including energy balance<p>> Exercise should be thought of as a 'drug'<p>I find it very interesting, that Ghrelin levels are afected by enery balance…<p>Does that mean that when there is a deficit, it rises? Also because of it’s linking with the reward system, exercise can set endorphins free (or something, it seems), which regulates appetite.