Why do some people pass gas when they eat cabbage or beans and others don't?

I was given this answer: Many lack the proper enzymes to completely digest the food. So the bacteria in you intestines break it down and gas is a byproduct. Beano is the enzymes in a bottle, thats why it helps with the gas.

However, I was still wondering: What are the proper enzymes and how can one get them without taking pills? Is it genetic or what? Does yogurt help?
Why do some people pass gas when they eat cabbage or beans and others don't?
I was told by a weight councilor once that the more fiber you eat not only help with regularity but also helps with gas.