My point was that the meal was unhealthy and he wasn't overeating and then I also pointed out that have 2 out of 3 kids being obese isn't normal. So simply eating unhealthy meals and playing video games all day long does lead to being fat (which, I'm not even sure why this was in question, it's simply how things work).
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Some people's bodies are stronger then others, but after some time you'll probably end up with high cholesterol and blood pressure (as those are commonly relating to being overweight). Not sure about diabetes, depends on how strong you pancreas it as if you don't lose weight you may or may not get it. My pancreas is a piece of shit, I want a new one.