Humans already know what's good for them. Self-help books rarely contain new information. All they contain is motivation, depending on how well it's written. People could substitute it with chatGPT, but its unlikely to provide the same motivation. That's why you could ask chatGPT for the 10 most important lessons in the 4 day workweek, but that won't get you anywhere.
Humans have know blocks for their own well being. Most struggle with probabilities or long term planning. But they are teachable skills.