My daughter developed an allergy to cow's milk when she was 6 months old. We put her on soy formula. She is almost 11 now and is having tremendous trouble with eating dairy (we don't have dairy in our house) when she is at a friend's house--she comes home horribly sick the next day. It IS possible to get the allergy back at a later date. Just because a child "outgrows" an allergy does not mean it won't come back later.
My husband and I both have casein allergy (we don't use any cow milk products, just goat and sheep), soy intolerance, and gluten intolerance. I also have mild, moderate, and severe intolerances to 21 other foods; it is my fervent hope that, having not eaten these foods for awhile, I will one day be able to tolerate a small amount. My daughter, as of right now, only tested postive for mild gluten intolerance. However, since my husband and I both have issues with cow milk and soy--and she used soy formula--I can see her developing issues with these in the future. Which is why we do not use cow's milk, soy, or gluten in our household.
It is a pain, it does stink, and it's very expensive to have to buy special allergen-free foods. But that's the way it is. Since we've quit eating these foods, we've all been very healthy.
I do once in a while cave and eat something with gluten. If I've eaten too much, I get an itchy anus. Yep, quite irritating, in fact. If I eat anything with cow milk products, I get diarrhea (I usually suffer from constipation) that is black, pflegmy/mucusy, and stinks. I'm also yellow when I wipe--a sure sign of cow milk allergy/intolerance. I will also break out all over my face (I'm 43 years old). My bones, muscles, etc. will ache, and I get very tired feeling.
Actually, there are over 300 signs/symptoms of gluten intolerance/allergy alone, without even getting into allergies/intolerances for other foods. And everyone is different.
I get hives--not from any particular food--but from the COLD. I have what's called cold uticara, and it's a pain in the a**. That one, there is nothing to be done for but to take a couple histamines when they show up.
Soy is in just about everything that is processed/convenient/bought off the shelf. We have to make most of our goodies homemade. You can find good products that don't have milk, soy, gluten, etc., in them, but then you have to make the product at home with your egg substitute, milk subsistute, etc.
Milk substitue: goat, sheep, almond, oat, hemp, rice, coconut, hazelnut.
Egg substitue: flax seed and water
I go grocery shopping at specialty stores--NOT the average grocery store where most people go shopping. I live in Madison, WI, and I shop at Whole Foods, HyVee (they have a food allergy/intolerance section), Willy Street Co-Op (you'd be surprised how many of your local co-op stores have foods for people with food allergens), Woodmans (a huge warehouse that just added 3-4 aisles of food for people with food allergens), and COSTCO. I do very little shopping at the "main" grocery stores in town, like Sentry Metcalfe (they have a teeny tiny section for people with food allergens), and Copps (they have a teeny tiny section for people with food allergens), or Piggly Wiggly (none), or Cubs (virtually nothing).That's just the way it is.
I get the magazine Living Without. It is dedicated for people with gluten allergies/intolerance and to all people who live with food allergens. I really like the magazine, and they have subsitutions in the back for all sorts of food allergies/intolerances. It's definitely worth the money to get a subscription.