The big trick is to simply not consume more calories than your body actually needs on a daily basis.
For most people that live sedentary lifestyles, that would mean "eat very little" but
most of the time that's just about as unhealthy as eating a "normal" amount of food. So the solution, really, is to just introduce more activity in your life. Whether that's through working out or something else, it doesn't matter. Other than that, all you can do is make sure you're eating a healthy balance of food stuffs. Your body should take care of the rest.
In my case, my metabolism is so high that anything I eat is almost completely expended in one way or another. In otherwords, I couldn't get fat if I tried. But a consequence of this is that I have difficulty putting on much muscle and I'm plagued by occasional bouts of hyperactive, spastic flailings of the arms and mouthpiece.
Well as for me I don't work out (WAAAAY too lazy and I find it pointless)
In what way is working out pointless?