> Ghrelin has been shown to have wide-ranging biological effects in areas including energy balance

> Exercise should be thought of as a 'drug'

I find it very interesting, that Ghrelin levels are afected by enery balance…

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.

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