I apologize for my sarcasm, although it's usually appreciated on here. My main point was that 3 8th graders out of 201 participants, none making an impact on the results, does not seem to constitute an unfair advantage.
While I agree there are horror stories of kids who are exploited and develop eating disorders, there are also plenty of healthy success stories. In fact recent seniors Tuohy, Morales and Walters all ran NXN as 8th graders and developed as seniors into healthy, athletic, (even muscular) well rounded seniors, who will all be attending college in the Fall.
I was making fun of the tendency here to look at every performance of these kids as a chance to predict their demise, pretty much ignoring anyone who has a happy healthy career. When I do come across a kid at a meet, who looks like they may be too emaciated, or facing an eating disorder, I choose to handle that privately with a coach or parent rather than calling out a high schooler publicly. There are problems, but on a case by case basis, not really a generalization across the whole sport.