How often do you eat fast food?

[Silent3]

110. People who do everything "right" die miserable deaths too.

Less often, but they still do. I'm not saying it's a good idea to eat lots of fast food, and certainly not a good idea to try to hypothetical of eating nothing but all your life. I'm arguing against the hyperbolic "not food" description of something that can, as you admit, sustain you.

As for you being an "expert in nutrition", that's a subject with a lot of differing opinions and unsettled issues, and an area of study that tends to draw a lot of fanatics. My sister considers herself an "expert" too, and gets paid to coach people in diet and exercise. She's also a right wing fundy nutcase, and her food advice is as tinged with absolutism and extremism as her politics and religion. You'll pardon me if your claim of expertise doesn't bowl me over.

Since (and I think this should have been obvious to you) a person who eats fast food every day of their life was a hypothetical construct, I obviously can't point one out to you -- nor did the point I was making require that I could. Most of us, however, know plenty of people with terrible eating habits who nevertheless get away with it, and people who make great efforts for good health, but still end up with bad health problems anyway.

It's a matter of shifting the odds, sometimes a little, sometimes a lot, of healthier outcomes.

Since it's just odds, not absolutes, and eating fast food once or twice a week is a long way from eating it for every meal, I think it's a fair guess that such a relatively infrequent indulgence isn't going to show up as such an enormous shift in outcomes that it warrants treating such food as POISON!11!1!1!.