No Thanksgiving here as I'm in the UK, so I hope it's alright if I answer your question with my safe and unsafe Christmas foods instead?
Christmas dinner is actually very safe (luckily!), as are roast dinners in general. Meat, gravy, Yorkshire puddings, roast potatoes, carrots, peas, sprouts - all safe for me. (I know peas and sprouts often do cause people problems, but I seem to manage small portions of them fine.) I stick mostly to white meat. Parsnips and stuffing I'm a bit more cautious about.
The very unsafe Christmas foods for me are the things containing dried fruit - Christmas pudding, Christmas cake and mince pies are too unsafe to risk.
What are you having, Asher?