The first thing I’d like to point out is that the left and right sides of the energy balance equation could both be giving orders, and both be taking orders. The two possibilities aren’t mutually exclusive. And I think you can make a case for it going both ways.

~ Stephan Guyenet, from The science of body weight and health

…but you should. Because the answer (to why we get fat) is complicated. There is no single, simple-to-control, cause and effect.

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