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Eating too much fatty and unhealthy food and Not doing any exercise can cause humans to put on weight. Thyroid problems can cause you to put on weight. From when you are born until you stop growing it is normal for you to put on weight at a steady pace.

(additional answer) Prior to civilization, when people lived as hunter-gatherers, it was common that people would experience periodic changes in the abundance of food; sometimes they would have lots of food available, and sometimes very little if any. So when there was lots of food available, people would eat a lot and gain weight; this extra weight would then act as a stored food reserve for times when there was very little food available. In a temperate climate, people might gain weight every summer and then lose weight every winter. Now, with food readily available all the time, this adaptation does not serve people as well as it used to. People gain weight and then they gain more weight, and they don't lose it.

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13y ago

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