Go back and look at what you originally quoted.
They specifically said replacing a healthy diet is harmful. There's nothing wrong with that statement, you strawmanned it to hell and back.
If you think that statement is talking about something different than what kids are actually doing, then say that instead of saying the claim is wrong.
And you still didn't explain how anything they called bad equates to "feel good".
> mens testosterone levels are half or 3x lower than they used to be on average
The contribution of obesity and diabetes to that is a lot and might be 100%. Trying to do diet things to directly change levels really seems like a bad idea because 99% of ideas probably do nothing and anything effective could overshoot so easily. The quote also called out kids self-managing synthetic hormones as a bad idea for that, and it is.