No I don't have a link but it's common practice for growers to dust tomatoes, grapes and apricots with sulpha to help them last longer. Most green grocers know about it but nobody ever tells you.
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I have the same thing with store bought tomatoes. It makes my mouth get all raw, homegrown ones are great though! I am also allergic to chocolate and spinach and raspberries (those three are deadly allergies) as well as casein (the protein in milk) and wheat/barley/rye and corn and apples and citrus and pork and salmon (but not trout, go figure) which are all pretty mild
Have you been on anti-biotics during your life?
If yes, how long for and how many different types of anti-biotic?
Have you ever been involved in a major accident or suffered a severe injury or traumatic experience?
Major traumatic experiences and anti-biotics have been linked to food allergies and intolerances. My dairy intolerance started after I was hit by a car. It was exacerbated by being put on anti-biotics for a month. The anti-biotics did nothing to fix the problem they were meant to be treating.
My wheat and gluten intolerance started after I inhaled toxic dust and was put on another dose of anti-biotics, which did nothing to fix the breathing problems I went to the doctor for.
And my complete food intolerance (except meat and fat) started after I was put on anti-biotics for a third time, and again they didn't do anything to fix the problem I went to the doctor for.
Each time I ended up on anti-biotics for a month and the doctors put me on several different types because the first type didn't work. I have a genetic predisposition towards wheat and dairy intolerance, which was activated by the accident and then exacerbated by the anti-biotics.
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re: wheat, barley and rye all have gluten in so you are probably a coeliac.
It's unusual to have an allergy to corn, however, I was unable to tolerate any grains (including corn and rice) for a couple of years after the last lot of anti-biotics. I have since been able to add corn and rice back into my diet but it took a few years of trying small amounts and taking heaps of probiotics (know idea if they actually helped).
Some people have issues with citrus due to the acids, and apples are sometimes an issue for some people. People with these types of fruit allergies are usually able to tolerate stone fruit like peaches, plums and nectarines. Try to grow your own or buy organic because some places spray the fruit and you react to the stuff being sprayed on them, not the actual fruit.
Pork and salmon but not trout, is interesting. Do you have an issue with pork meat that is just a cut of meat like a roast pork or pork chops, or do you have an issue with bacon and ham?
Bacon and ham have nitrites in and this is a preservative that a lot of people have trouble with. Nitrites have also been linked to various intestinal cancers.
re: Salmon. Do you know if they are from fresh or saltwater?
Very few people are allergic or intolerant of fish. To be intolerant of salmon but not trout is weird. It's possible the salmon are eating something that you are reacting to and the trout don't eat the same things. The salmon might be eating a lot of shellfish or crustaceans (prawns, crabs) and you are allergic to this not the actual fish.