Well, seriously, hell isn't really fire and brimstone, in Catholic theology. It's permanent, eternal separation from God, however helllish and torturous you consider that to be, made all the more miserable by the knowledge that you've got no one to blame for it because you chose it yourself. I guess endless burning alive is just the classic medieval idea of maximum suffering.
On the subject of life after death, and such, a Jewish friend once said to me, "I suppose our view is that you make your own heaven or hell here on earth - for yourself and for other people." I see a lot of value to keeping that in mind.
But back to the food. Forget not to abstain from meat on a Friday, or to fast on a fast day? Forgetting may be a lapse of discipline, but I presume (!) God allows do-overs, as soon as you remember. Not that I think God is such a micromanager; I think it's really about developing one's own discipline. Sounds like I'm rambling, but I am honestly curious to hear how others whose food choices are constrained by their beliefs deal with lapses.
"Your swimming suit matches your eyes, you hold your nose before diving, loving you has made me bananas!"