The joke is that Tony depends on exploiting lower class, working people. Hulk is suggesting investing in society, the poor. The next panel is Hulk launched into space (which happens for a different reason in the movies), because Tony doesn’t want Hulk to be listened to, because Tony would lose money.
As a GP, I wholeheartedly agree. I have a minor in nutrition before studying medicine. I try to talk to my patients and they brush me off. My clinic has a dietitian, and they NEVER want a meeting with her. The only exception has been pregnant women.
I still do agree some more teaching could be helpful, but it’s likely only helpful in POST-graduate training, like, family medicine. Future surgeons, for instance, aren’t likely to need depth on nutrition, and the degree is already very loaded without much room to trim.