Not talking about packaged meals...but the beef, pork, chicken, eggs and vegetables themselves.
It's all grown using industrial farming procedures which has slashed nutritional value while trying to salvage some bit of taste and palatability.
Even if you grow your own veggies but use commercial seed, you haven't gained much...better control of what is dumped on them while growing. If you go that route try to locate "heirloom" seeds...and keep the seeds from the very best of the crop for next time...unlike commercial seeds, those seeds will germinate.