That is not bad advice

You want to listen to your body because it tells you way more things than just feeling hungry. That is a gross simplification of that suggestion, almost assuming human bodies are machines.

Bad advice in this context is saying "you are gonna be happier if you lost weight" or "you are gonna look better if you lost weight". That is extremely personal and changes person to person, some might even feel worse.

Listening to a doctor's concerns is for everyone with no exclusions, but feeling good in oneself's body is another different topic that needs to be tackled appropriately.

Listening to your body is meant in the context of over-exercising though. It’s not a blanket get out of exercise card. That’s called “listening to your brain”.

Listening to the body is a rule of thumb. If you feel bad after eating/drinking something it's probably not good for you. If you cough from something in the air it's not healthy to inhale.

It's especially true in high octane workout culture like cross-fit, if it hurts then don't continue, this is how you end up with a herniated disc.

That being said, if you're on heroin you shouldn't listen to the body. Same with cigarettes, junk food, sugary drinks, candy etc. because the body is a dopamine whore.

Don't listen to food adverts. Broccoli doesn't have a marketing budget.

Listen to your body, assess how its feedback comports with your goals, then use your brain to decide what to do.

Listen to your body as in observe your body and how it responds to activity, certain foods, medications and environments. That's good advice. There are many bad doctors out there.

famines are increasingly likely.