it is probably part of the same phenomenon that made my bubba's chicken soup such effective medicine. That is, the exact same food can become very positive or very negative depending on when in the sickness cycle you experience it. Eat a novel food just before you feel ghastly, and you may well be put off it for life. Eat it as you're on the mend -- and the return of appetite is always a good sign -- and you'll probably ascribe magical properties to it, and turn to it whenever you're feelibng a bit better after feeling awful. Constraints on learning and all that.