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03.04.2012 |
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The animals around us are getting fatter
The obesity epidemic is not just confined to Homo sapiens. According to the biostatistician Yann Klimentidis of the University of Alabama at Birmingham, rhesus monkeys, meerkats, blue monkeys, chimpanzees, mice, rats, cats and dogs are all getting fatter and fatter. So maybe our increasing girth is not due to constantly eating too many Pringles in front of the tube, suggests Klimentidis. Maybe there's more at hand.
The obesity explosion
Of course, we get fatter if we consume more calories than we burn. Yes, there's more junk food available than before, and yes, we get less exercise than ever. But two hundred years ago there was also a small group of rich people, who led a sedentary life and could afford all kinds of calorie bombs. And in this small group obesity was a rarity. The members of this elitist group did manage to regulate their energy intake in accordance with their energy expenditure.
So why can't we do this any more? Some researchers want to know why. Are we being exposed to something we are unaware of? A chemical substance that's destabilising our brains? A virus that forces us to eat more? Is there an environmental factor which prevents us from being able to regulate our energy intake?
Study
Results
In macaques the likelihood of obesity [morbid overweight] rose by 114 percent; in chimpanzees the likelihood rose by 1100-1800 percent; in blue monkeys by 83-834 percent; in meerkats by 170 percent.
The data presented above concerns laboratory animals. But Klimenditis found a similar fattening trend in the animals that live under less controlled conditions. Dogs and cats also become a few percent fatter each year according to his data. While the rats in our surroundings receive less tender loving care, their bodyweight is also increasing according to biologists' studies of captured examples.
The figure below summarises the findings. It shows the increase in the chance of obesity and the increase in bodyweight per decade per population. If you click on it, you'll see a bigger representation.
Other studies
There's definitely something going on. There are unknown factors at work in the overweight explosion. Substances that interfere with hormone balances? A virus? Bacteria? Kleminditis has nothing to say on this.
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