How to know whether something is good for you or bad for you?

[Zion]

Is it intuition? 

What's your perspective?

[Leo Gura]

Just honestly ask yourself.

[Blackjack38]

If you are wise, intuition. If not, then trial and error.

[M A J I]

Every being in the universe naturally knows, its called "feeling" and "experience". If you are growing and expanding then it is a good thing or bad?

[Brandon Nankivell]

Yes, intuition. Just be honest with yourself like Leo has said.

[gettoefl]

investigate what is bad for you through direct experience

take the attitude that everything is good for you then exclude those few bad things

eg food, i like anything and everything so i eat a variety of foods and this is good for me ... a few currys don't agree with my tummy so i steer clear

be open minded flexible adventurous

[Israfil]

2 hours ago, gettoefl said:

take the attitude that everything is good for you then exclude those few bad things

 

Don't follow this. You will end up addicted to heroin.

[Dauntment]

Recommend 

 

[Buck Edwards]

Simply ask how it impacts your health.