I trained myself to loathe sugar and other carbs with the full range of the "Im/purity" component of morality (see Moral Foundation Theory). Since one aspect of religion is morality and especially the Impurity aspect, I gathered all Scriptural references to the evils of carbs in an essay.

I really had it bad (e.g., my hand would reach out for a cookie, as if my instinct) before, and I have actually been off sugar and most grains for two years or so, though I have not lost weight.

Summary: Think or say "vomit" whenever sugar is mentioned or seen, and you'll eventually come around.