The last time I ate game, I shortly afterwards came down with an unpleasant and prolonged digestive upset. I know the meal didn't cause my sickness because my sister also ate the same meal and she didn't get ill.
But when I sat down last night to eat a pheasant and mallard casserole I made for my dad (who has come to stay with us over Christmas), I just couldn't eat it. It was delicious, but still I couldn't force even one forkful of it into my mouth.
I know exactly why this is. The Garcia effect is the name given to the urge to avoid any novel food which is followed by symptoms of sickness. Most mammals have this instinct, including humans.
It's most infuriating. Perhaps I'll never be able to eat game again, even though I know it's tasty and perfectly harmless. But millions of years of evolution are overriding my modern conscious brain, and telling me "No!"