AvonCallingBarksdale Thu 11-Oct-12 21:53:09
May I just ask, as I don't have experience of allergies/food intolerances, so I'm genuinely interested. If you are allergic, how can you not have an allergic reaction to your allergen? Doesn't that mean you're not allergic isn't that more of a food intolerance? Not having a go, just don't really get it. However, whatever the issue is, you shouldn't feel you can't have a rational convo iwth the head.
I'll try and explain, I'm not an expert but have an allergic child with epi-pen.
Allergens are proteins - when they enter the body it see's it as a foreign/ threatening thinhg and produces antihistmines (its a mast cell and basophil reaction). Things attach themselves to each other and this response is what causes the reaction. Can be simply a hive (yep just the 1!), full body hives, swelling to face,lips, extremities and/or full systematic response which makes throat swell, stomach cramp, and shock which requires adrenaline.
There are 2 types of allergy. IgE mediated and non-IgE mediated. IgE mediated are the ones we often see as immediate (eg peanut allergy most think of when thinking of anaphylaxis). Other common allergens for IgE mediated allergy are milk (cows milk protein), egg, fish, treenuts, celery.
Non IgE mediated allergies usually take longer for the reaction to occur. From 2-72 hours after the allergen is ingested, contacted etc. Non IgE mediated allergies cannot be proven by tests because of the delay and are diagnosed on an exclusion diet. Ige mediated allergies can occur up to a few hours after ingestion as well. Both Ige and non-Ige mediated allergies can result in anaphylatic shock. (called anaphylactoid shock in non IgE mediated allergies)
Food intolerences are to sugars, fructose, lactose etc and are caused by a lack of or lesser amount of the emzymes needed to break these down being present in a persons digestive system. To discover what someone is intolerant to it is done by elimination diet.
The reason people react differently to the allergen each time is very similar to most illnesses. As allergy is an immune response you may react worse if your body is fighting an infection for example. Also it may notice an allergen and produce histamine but not a large amount. (strangely it doesn't seem to react according to the amount of allergen!) and so only a small reaction or the body may go on full attack mode producing loads of histamine and go into anaphylatic shock.
As with an infection - you can get a mild case of flu but the same strain can kill another person.
Also with allergens because they are proteins you have to remember that when foods are made and cooked the protein structure is altered and it may be that your body reacts to the protein most in its unchanged form - eg straight milk from a cow.
I hope I have explained it a bit? (sorry if I've confused you
)
I think basically people need to understand that we as parents and the GP's etc cannot say how bad a reaction could be, but we are all too aware that it only takes that 1 reaction that could potentially kill our children. Obviously however we want them to live a normal as life as possible to try to minimise risks for them.
rational I see now why your DD would accept a chocolate cake. Perhaps a solution would be for you to provide some 'safe' desserts/ treats etc for when they can't or your DD is unsure she should accept the pudding on offer?