No, "ignore everything and do whatever you like" is terrible and dangerous advice.
I read it more as "there's no one true diet" which seems to gel with my personal observation.
The best exercise is any exercise you actually do - the best diet for you is one that is both healthy, and that you can adapt to. Small adjustments are more likely to "stick", and doing something small can be beneficial.
For example, I'm not going to entertain "go vegan". That's too big a jump. But cutting down on meat is achievable. I'm not going carb free overnight, but I can start to reduce sugar (no sugar in coffee for example), eat more nuts for snacks, and less chips, and so on. I can do a "carb free month", I can reduce portion sizes.
Ultimately my balance will be different to the next person's.
Especially from anyone that has a “miracle” cure just for you.
I have never eaten breakfast, always hated eating before lunch.
Having had this exact comment thrown in my face for 30 years. Turns out ignoring everything and doing whatever fit me was not only healthy but has strong scientific basis.
Aka intermittent fasting.
Do not give bad advice or scold people for listening to their bodies and follow what works for them.
This is terrible advice sir
https://www.livin3.com/obesity-statistics
https://www.tuwamari.com/blog/how-america-became-the-most-ob...
Both options are dangerous.
There's a third option: actual nutritional science.
A better approach is to conduct your own informal n=1 experiments. Try different diets or eliminating certain foods. Keep records of your athletic performance and of how you feel to find what works best for you.
This is not dangerous advice: this is exprimentaion, beacuse modern medicine has obviously failed them.