I'm intolerant of the entire Allium family. Which is tragic as I do love cooked onions and garlic. I'm not allergic. I don't get hives or swelling - there is no risk of death. I do experience nausea, retching, vomiting, diarrhea, sever headaches, mild confusion and then feel hung over for a day. It's quite unpleasant. I've had these symptoms for years and had a difficult time sorting it out. I've been tested for glutton intolerance, had my colon scoped and biopsied, blood tests etc. - the docs couldn't identify anything and said it was stress. I suspected onions but my wife thought it was all in my head - so she would use onions but tell me she hadn't. 20 years this went on - only last summer did she admit this to me. I then took control of my diet, kept a food log and with much trial and error narrowed it down to all things Allium - and pistachios (but not cashews or mangos which are in the same family...).
My wife recently made two pork roasts - one for me, one for the rest of our guests. Mine was onion and garlic free, but the other one, she sticks a knife in the roast and then stuffs garlic cloves in it - she makes a great roast, I wish I could still eat it! But alas, I still got sick - they were cooked in the same oven.
My niece who is very conscientious and a wonderful cook asked if she could use asafetida as a garlic / onion substitute for me. I had never heard of it and said it was worth a try. Unfortunately, my symptoms were even more immediate and severe with asafetida.
My 'research' (web surfing) has stumbled on a few interesting things: Ancient Chinese medicine listed the Allium family and asafetida as 'Pungent' Plants - all to be avoided - and they listed symptoms / reactions similar to my one experience. Also, one site noted that military physicians for test pilots in the 1950s told them not to eat garlic 72 hours prior to a flight as it doubled reactions times (i.e. made the pilots slower to react) - some evidence apparently involving chemical changes in brain membranes. I'm not a doctor or scientist.
Last week I ate at a very fine restaurant and explained my situation to my wonderful server. She consulted with the chef and they offered to prepare a lovely fresh fish dish. When the meal came, the gentleman (not my server) who brought my plate gave me the 'tour' of my meal explaining every little thing to include that the sauces were on the side. They were very yummy! But after three dips of the cod into the sauce I was not feeling well at all (cramps, headache, confusion) and I asked what the sauces were. Pureed carrots and onions! When I asked why he would serve me something that I've saidI can not eat he explained: 'That's why I put them on the side." My server came over and was very apologetic and sincere - but what could she do at that point? The owner of the restaurant came over to take my desert order - and I'm assuming in an attempt at humor said: 'our deserts are all free of garlic and onion!'
I was up all night with the previously mentioned symptoms and sick the entire next day.Â
The meal, service and ambiance were otherwise wonderful, but clearly they are ignorant of food intolerances.