A Primal Primer: Leptin

June 17, 2010

Just about every physiological process occurring under the hood can be attributed to one hormone or another. Hormones are like software programs, directing our bodily processes, modulating our reactions to foods, and guiding energy metabolism and balance. We don’t consciously control our hormonal responses – that is, we don’t think to ourselves, “Hmm, let’s get some testosterone flowing,” or “Insulin: release!” But we can heavily influence our hormonal responses through the things we do, the stress we undergo, the foods we eat, the weights we lift, and the sleep we get.
One crucial hormone that we’re still learning about is leptin. We do know a few things, however. Leptin is the lookout hormone – the gatekeeper of fat metabolism, monitoring how much energy an organism takes in. It surveys and maintains the energy balance in the body, and it regulates hunger via three pathways:

By counteracting the effects of neuropeptide Y, a […]

Original post by Mark Sisson

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