Check out www.celiac.com they have tips, recipes and a HUGE message board that I found invaluable my first couple years learning to navigate the GF world. Like another poster said, you don't always know when trace amounts are causing problems, especially if you've been living with it so long that you have total atrophy, I'm going to guess you're symptoms weren't that overt? Or you were just mis-diagnosed for years, like me *sigh*
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I am one of the 10% that is super sensitive, so I avoid anything that is "the same line" but don't sweat "same factory" unless it makes me sick, then I put it on my "no" list. As for cookware, after making myself super sick a few times, I tossed everything plastic or wood and started all over again. I've gone mostly non-plastic in my life anyway, we use glass instead of tupperware, etc, but that really is a personal choice for people, especially if you are dealing with a shared kitchen. Tin foil is your friend :)
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I would suggest starting off with really simple foods for a while, to give your gut a chance to heal faster. Avoid dairy, since if you're atrophy is that bad, the parts of the celia that deal with dairy aren't there anymore. Avoid processed foods. Rice, soups, whole foods. Soy can be a big trigger too if you've been sick for a long time. Avoid Oats, even though some people say they are ok, a certain percentage of celiacs cannot tolerate them, wait to test them out until you've been GF for a year at least, to let your body have time to heal so you can tell what your reactions are. Be careful jumping straight into ready made GF products, they tend to have higher fat and sugar content than the mainstream ones, and especially if you have been having lack of weight gain issues, the sudden increase in these things can cause you to gain weight very quickly.
Check your vitamin D levels. Celiacs don't absorb this well, even after diagnosis and diet changes and most of the foods that have it added in we can't eat. Low vitamin D can impede the gut healing properly.
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Welcome, remember it's not that hard, and good luck!
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