Saying you should eat better food is longtime good advice. Ascribing it to RFK jr is laughable. Keep in mind that the right crucified Michelle Obama when she wanted to bring healthier food into schools as being some kind of infringement of freedom.
The cold hard reality is that RFK jr is a rank amateur with essentially zero training or knowledge in science or medicine and he shouldn’t be close to any important position controlling the direction of science or medicine. If his last name wasn’t Kennedy, he would be some old guy standing on a bench yelling as people walked by ignoring him.