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Riconquer2 t1_jeb9sg5 wrote

Reply to comment by Reasonable-Umpire-93 in Eli5 what is it in the food of fast food restaurants that makes it bad e.g. being linked to cancer / mental problems. Does it have a negative impact on the gut flora? I’m not talking like sugary food more like actual food KFC- chicken, McDonald’s beef patty etc by Reasonable-Umpire-93

That's a correlation, not a cause. That just means those two items might be related. For example, it could be that people with mental issues choose to eat fast food more often due to poor planning or decision making. It could be that poor people tend to both have more fast food and have more mental illnesses.

Put simply, I'd hesitate to use that study as evidence of fast food causing mental health issues.

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