I've been reading that very serious thread about cravings, which has deteriorated into a very serious discussion of eating ketchup. My two cents worth:
I like ketchup by itself, but I prefer to spread it on bread. A bun works well. It's even better with a little chopped onion. Just to give it crunch, I often put a leaf of lettuce on there or even a slice of ripe tomato for color. Sometimes, I swipe a little mustard on the other side of the bun. If I'm not in one of my vegetarian moods, I often grill a patty of ground beef and add that to the the ketchup. Eating ketchup all by itself is OK, just as long as you do it right.
Howard