You are what you eat.
And after a while it may show so eat healthy.
I'm stopping short of preaching exercise but within your own limits it is a good idea.
According to Web MD there are many good snacks out there but you are most likely not eating them.
So click on the above link and check out which of your favorite munchies are good for you and which are not.
And don't blame me, I'm just the messenger.