A diet that induces obesity causes inactivity first
https://www.sciencedaily.com/releas...61229141901.htm
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http://www.sciencedirect.com/scienc...550413116305964 The study itself is full access. I think some of this applies to lean "lazy" people as well. A healthy person isn't on a forced march, all gritted tooth and determination--moving is supposed to feel good, I don't think it's all a matter of character (unless we admit that much of what we call "character" is just how an underlying physiology manifests in a person's behaviour). And, not to rule out a little bit of self-imposed forced marching, but I think it will be more likely to be effective when the exercise itself promotes the sort of changes in brain physiology that promote activity--providing diet induced obesity animals with running wheels does help, perhaps by providing an activity that's a bit more fun than just scurrying around a cage. Similar to the thing with food, perhaps, where an obese animal will eat less of a low reward food like low fat chow. Obese mice have a higher threshold for sweet and fatty flavours--subtle foods become less enjoyable if they can't taste the light sweetness, something like an oreo is so blatantly sweet that an animal that's less sensitive to sweetness can still enjoy it. http://www.sciencedirect.com/scienc...550413111003093 Quote:
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Interesting. Does sugar and/or excess insulin have a negative effect on dopamine receptors?
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Sugar has such strong effects on dopamine receptors that the brain downregulates; then it takes more sugar to get the same effect. |
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If extra body weight were disabling, all those beefy gym rats and football guys who must weigh a ton more than less muscular people would therefore be disabled by their extra body weight, but they're obviously not. I've always thought the same thing goes for the argument that carrying extra pounds of fat is bad for the heart simply because of the extra blood vessels inside that fat that the heart must pump blood through. Muscle's got to have a lot of blood vessels supplying it, too, yet you never hear people complaining about how bad all the extra distance pumping through all that excess muscle must be for the heart. Or any complaints about stressing our hearts and being bad lifting iron in the gym compared to lifting our own bodies to move around if we're obese. We had one of those body fat scales that measures your lean (muscle, bone etc.) mass and I was amazed at the huge amount of sheer muscle of someone morbidly obese that tried the scale. Obese, yes, but hugely muscular underneath from the daily exercise of moving a heavy body around. So something else likely not about body heaviness/difficulty of moving heavy things is going on. And it sure can't help that when hormones are out of whack making you gain body fat that your body is partitioning needed fuel away from other working organs like muscles, heart and brain to the fat cells. Not surprised dopamine and who knows what else could be messed up under such conditions. I'm glad to see some researchers taking obesity scientifically seriously rather than the tired old bigoted insults of overeating and laziness that get hurled at heavy people. |
One mostly undisputed observation is that if you get the sweetness just right, an animal will eat more of a chow--and that would probably contribute to the effects in this study.
The diet they called "high fat" vs. the control diet was also entirely purified--I don't know if it contained that much more sucrose, but where the control diet had ingredients like soy meal and hulled corn, the experimental diet had sucrose, soy oil, vitamin and mineral mixes, maltodextrin, etc. |
Most of the livestock feed uses Molasses which is high in protein.
In the winter we also feed big tubs of molasses mixture so they will produce internal heat for warmth. But the livestock aren't lazy after that....... |
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