I apologize ahead of time, as I cannot provide a link (haven't found it so far) but I had heard a study on the radio where rats were fed a little too much food, and some were kept cool and others in warmer temperatures.
The thought was obviously the cooler ones would gain weight more slowly, having to burn off more calories to stay warm. Yet the opposite happened. The cold rats gained weight significantly faster than the warm ones.
Autopsying the rats, the cold rats had grown larger intestines (I don't recall if it was longer or wider or what, if they even said) and thus presumably absorbed significantly more energy from the food.
The point was there are studies showing animals will eat more in colder weather, but this showed the weight was packed on with the exact same amount of food eaten due to more intense digestion.
Now there are lots of countries surpassing the US as we speak in obesity, these are all hotter weather climates like Mexico and the Middle East, where more and more people are having the cash to buy air conditioning these past decades.
It couldn't be the only thing, with more sedentary lifestyles, cheaper high-calorie, ready-to-eat food, and so on. It just seemed quite interesting because if it is accurate and applies to humans, too, it could be the lion's share of that weight gain.
The thought was obviously the cooler ones would gain weight more slowly, having to burn off more calories to stay warm. Yet the opposite happened. The cold rats gained weight significantly faster than the warm ones.
Autopsying the rats, the cold rats had grown larger intestines (I don't recall if it was longer or wider or what, if they even said) and thus presumably absorbed significantly more energy from the food.
The point was there are studies showing animals will eat more in colder weather, but this showed the weight was packed on with the exact same amount of food eaten due to more intense digestion.
Now there are lots of countries surpassing the US as we speak in obesity, these are all hotter weather climates like Mexico and the Middle East, where more and more people are having the cash to buy air conditioning these past decades.
It couldn't be the only thing, with more sedentary lifestyles, cheaper high-calorie, ready-to-eat food, and so on. It just seemed quite interesting because if it is accurate and applies to humans, too, it could be the lion's share of that weight gain.
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