IMO, food allergies are regular allergies, the sinus ones are different.
I am allergic to tree nuts. Ok, some of them I am just sensitive to, but I don't want to take a chance when they could potentially cause my throat to swell shut. This is if I eat them, touch them, if my husband eats them and then kisses me, or ... well, that's private.
Bananas are less frightening to me. I can be around them, eat banana bread (nut free of course), and even be around a toddler eatin fresh bananas. I don't react to the scratch test or blood test for them. However, about 2 hours after eating one, I break out in hives, first on the back of my neck, then my ears and face. I feel like pulling my hair out until the reaction has run its course.
Fermented foods are a different kind of reaction for me. If I sniff them, like beer, yeast, vinegar, I feel ill. If I eat them, nothing happens, but if I put mayo on a sandwhich one day, have a salad with dressing the next day, and then top it off with ketchup on my fries a third day, I get a burning rash in all the hot spots on my body. It might not be so bad if I wasn't overweight, but I'm working on that.
My granddaughter however, is different again. She has all kinds of allergies and sensitivities.
Eggs = headache
Dairy = Asthma attacks (she is otherwise medication free)
Gluten = the usual stomach ache/celiac reaction
Soy = behavioural issues, including violent outbursts, inability to function mentally, hyperactivity
Strawberries = swollen lips if they are in the room with her or if they were in the room before she got there
Mangoes = no reaction so far, but they test as worse than strawberries
Tomatoes = same as mangoes
Various other foods, including rice, shrimp, pineapple, kiwi, buckwheat are sensitivities. Some she can have but in moderation.
Birch and Alder trees = itchy, watery eyes, and breathing problems
I have one daughter who has a reaction to cow's milk, but we figured out that she reacts to anything with estrogen. Not an allergic reaction, but siezures. The estrogen triggers her epilepsy.
I have another daughter who reacts badly to the minerals in water. This carries over to soaps and shampoos for her. Her wedding ring is made from jade rather than metal.