No guilt for an accidental exposure. It happens no matter what. My daughter was exposed to cane sugar and had 2 days of diarrhea. Get this, she was exposed by a VERY careful father of kids with celiacs. He's really good at watching their food. He even made the pizza crust without egg in case my daughter couldn't have it. He assured me left and right there was no cane sugar in the crust. Absolutely none. Oh well, accidents happen.
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If you think there is enough gut damage that you might have problems, I wouldn't put your child's health at risk. Maybe figuring out how to eat enough calories without dairy might work better for you.  Give it time. My daughter is gluten, dairy, cane sugar, and tomato free. And we are vegetarians. I LOVE this diet and, other than the tomatoes, have no desire to undo it. I've put on 10 pounds since starting to eat this way. That's MY problem to overcome.Â
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So, instead of parmesan cheese on our pasta dishes, we have cashews. Instead of milk to drink, she has Rice Dream. (Because carageenan is an intestinal irritant, we avoid that. It's in most non-dairy drinks. So is cane sugar.) I just learned the Silk brand almond milk doesn't have cane sugar or carageenan. I'll try that. Otherwise we stick with Rice Dream, Trader Joe's brand rice milk, Trader Joe's brand soy milk, and Trader Joe's brand refrigerated vanilla almond milk. If you can do cane sugar, there are a LOT more options.
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I use a lot of coconut milk. I make my own ice cream and whipped coconut cream out of it. I make creamed veggie soups with coconut milk. I make pudding by blending an avocado, banana, 1/3 c cocoa powder, 1/3 cup non-dairy milk (usually coconut milk,) and 1 to 4 T honey.
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Do you use Earth Balance in place of butter?
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Look at www.elanaspantry.com for great DF recipes. She uses almond flour a lot. Coconut flour as well. And the food is beyond yummy.
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Also try http://glutenfreegoddess.blogspot.com/ She has lots of dairy free recipes. That's where I learned to use coconut milk in my creamy soups. (though in the wrong recipe, it gives too much sweetness. I tried making a lemon bechamel sauce with coconut milk. My husband said it tasted like lemon cream pie.)
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What about nut butters? When I'm taking the kids out and about, we have rice cakes with nutbutters and all fruit jellies. You have to take the components with you as the rice cakes will get soggy if you pre-make them.
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There are SOOO many great dairy free recipes out there that you should not be hungry or underweight because of being dairy free.Â
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Also, what about DF yogurts? My little one can only do one brand of almond yogurt sweetened with fruit juice as all the other DF ones are sweetened with cane sugar. In addition to soy yogurt, there's also coconut milk yogurt.
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If I can help you find more DF foods or recipes, let me know. Otherwise, just google "dairy free broccoli soup recipe" and millions (literally) of choices will come up. Same with any other recipe you can probably want.
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The way I figure it, if I can make brownies out of black beans and prunes and have my son eat half a pan in a day, there are plenty of ways to eat what you want in a healthy way despite most food restrictions.