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Obesity is complex. I think we all know that at this point. There is no one reason why any of us become obese; it's a combination of several factors including genetics, physical activity, hormones, calories, fat, carbs, junk food, and much, much more. We can of course say that we get fat from eating more calories than we expend, that's a fact... but that doesn't tell us anything about why we're consuming more food than we need. Likewise, we don't truly know the best way to lose excess weight. We need to eat fewer calories than we expend, duh. But we have to worry about complicated things like hunger, willpower, and cravings... and why it feels like your body just wants to hold onto that extra fat.
Enter: Food Reward.
I've touched on this in the past but I haven't given it a proper explanation. I first heard of the concept via
Stephen Guyenet a couple years ago, as most people in the ancestral health community did. It's taken me a while to fully warm up to it and truly understand it, but I'm now convinced that this is a major reason, perhaps
the major reason, for the obesity epidemic. Allow me to explain.
The Reward System
Our brains contain a "reward" system that is critical to our survival.
Actions that promote our survival are reinforced by the brain by making us feel good... this makes us want to do them again. For example, running around in the sun playing frisbee makes us feel good; the sun is good for our health (in moderation), physical activity promotes fitness and survival in the most primal sense, and it gives us a sense of community and kinship with our friends. Our brains tell us that playing frisbee in the sun is a good thing, and we're likely to do it again in the future.
But the reward system also works the other way, discouraging actions that harm us. If we pick up a baking dish out of the oven with our bare hands, we'll burn our skin, and so our brains send a very strong signal for us to STOP (pain). Addictive drugs essentially hijack this reward system. Heroin, for example, will bypass the environmental sensory aspect of the reward system and latch on to the receptors in the brain. Drugs like these provide a super strong stimulus, hence they are reinforced by happy feelings, and you'll want to do it again and again until you become addicted.