But "you need to read up on healthy foods/workout routines" is something completely different from "listen to your body".
The two statements are similar in one way, though: Completely useless as advice that will get people healthier. "listen to your body" will get people to eat what they wan't. "you need to read up on healthy foods/workout routines" will get people to read all sorts of bad advice. Like, for example: "listen to your body".