I've never seen a single person that's super preoccupied by stuff like GMOs also being an athlete.
I have the privilege to work, almost daily, with very healthy people, many of them young, and many from disadvantaged communities. Some have lived for years on a diet of the cheapest bread and yogurt, with the rare weekly chicken backs soup and some meat paste spread.
Yes you already bragged about what an amazing trainer you are training amazing athletes wow its so amazing but nobody gives a shit, also (outside of the absolute highest levels which you do not belong to) personal trainer is a retard job for poor people and your local affletes aren't special for being able to run and jump at a collegiate level
No kidding you can technically live on bread and milkfat for macros, especially when it's real bread and minimally processed dairy, which it is because as I recall you live in a shithole country. Bragging about athletes not getting enough meat, a key source of protein, says more about your parochial mindset than it does about good practice.
The suggestion that someone take up a professional training regimen as a hobby in order to compensate for artificial food intake (fake food is a concept you don't really understand because you're unfamiliar with decadent western living) is absolutely retarded. Diet is THE primary factor for being healthy and in good shape, so internet bragging about malnourished athletes aside, the only way you can overcome a shitty diet (at least in part) is to train like you're trying to make the olympics. Running isn't even good for you. Nobody should run 50 miles per week in order to balance their caloric intake. A few pastries will offset an entire hour of running.
The entire argument is basically specious and I'm not sure it's even being made in good faith. No real coach training actual capable athletes (at least in the west) is going to tell them "fuck the diet just train 6 hours a day and eat whatever you want". You have to eat very well in order to compete at serious (aka not romanian village) levels, because your competition is doing the same. This will apply more to something like say, bodybuilding, than it does to long-distance running (neither of which is a real sport tbh), but everything is so specialized now that even regional competition requires you to utilize every tool you have to match the competition.
Of course the thread OP is kind of retarded too, conflating GMO with artificial ingredients and so on. The answer to the question is pretty obvious - because it maximizes profit - and while it's a terrible situation you can avoid it almost entirely by A) cooking your own food with basic ingredients and/or B) making enough money to buy expensive groceries.
On a personal level, some of my best gains have been from dietary changes. These were hard gains that were made at already high performance levels. I cut out the goyslop and spend way more on groceries. I don't drink corn syrup or eat fast food. This has been extremely effective and allowed me to cut
back on exercise, instead of using all my personal time to work out and wearing my joints out in the process. Could I achieve similar results (ignoring long term health effects) on a diet of rye bread and plain yogurt? Probably, but I'm not a malnourished peasant