That's the old "My grandfather smoked 30 fags a day, drank 10 pints a night, ate loads of fried food, and lived to the age of 81" argument!
The grandfather in question might well have lived to 95 if he'd looked after himself better!
Perhaps you would already be doing sub-50 minute 25s if you had junked the junk ...
Yebbut there's a difference between health and performance. Lots of foods that are good for performance in one context or another are arguably junk.