Identifying my allergy; is this lectin or fructose sensitivity or something else?

Answered on August 19, 2014
Created January 08, 2013 at 4:11 AM

I've what appears to be an allergy/sensitivity to many foods. I'm still not entirely sure what it is I'm allergic to, but I've had success in reducing symptoms by avoiding the below foods or loading up on anti-histamines and ibuprofen right before/after eating these.

  • sugar (seems even "fake" sugar causes problem, but fructose/fruit is the worst)
  • most grains (I still eat rice and noodles)
  • most fruits
  • most nuts
  • chocolate
  • pizza
  • most junk food and fast food
  • goldfish, cheeze-its, chips, crackers, oatmeal, cereal (even Kashi or Whole Foods Market dispensors), 100% fruit juice, flavored beverages
  • most fried foods (makes no sense?)

I get rashes and lumps that scar after eating these foods.

I'm usually okay with just a little occasionally. But, I'll have some McDonalds, a few slices of pizza, some cereal or oatmeal, a soda or (100%) grape juice, a handful of goldfish, or a piece of candy, and later in the day my body would remind me with itchiness, bumps, and scars on my skin.

And strangely, coconut water and (plain) yogurt seem to be okay, where both have sugar. In fact Kefir appears to somewhat lessen/delay my symptoms.

I happened upon this and thought I had finally found the source of my problems:


yes, fructose sensitivity/intolerance (possibly combined with insulin resistance) or lectins. the liver has downregulated its ability to process fructose and can cause allergic reactions such as itching, dry or peeling skin, rashes, blotches, acne, dandruff etc. this means most fruit, alcohol, sugar, conventional honey (but raw or raw fermented honey may be ok), nuts, beans, chocolate, grains. ??? dsohei Jan 16 2011 at 22:07

But the more on lectin I read, the more conflicting the information I get. Isn't there lectin in everything? Is lectin just another boogey man? Why would I have problems with both fruit sugar (fructose) and grains (lectins), doesn't that contradict?

TL;DR: I'm allergic to a lot of stuff that seems to match someone's description of fructose and lectins. But I don't really understand what that means. What could my body really be reacting to and why? What can I do to "fix" it so I don't have to constantly worry about getting rashes if I eat something wrong?

Also is this an allergy or just sensitivity? Why does taking anti-histamines help if it's not allergies?


on February 19, 2013
at 09:55 PM

"You already know what to do".

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3 Answers



on January 08, 2013
at 12:15 PM

It sounds like paleo would be perfect for you. All those things you mentioned are simply off the menu, which sounds like it'd help set you straight. (No grains, no dairy, no modern vegetable oils, no legumes, no sugar).

If you want to learn more about why all that seems to affect you so strongly, try Wheat Belly by Willam Davis and any good Paleo or paleo-oriented book, like The Paleo Answer by Loren Cordain or The Paleo Diet Solution by Robb Wolf or many others discussing primal and evolutionary nutrition. Good Calories, Bad Calories by Gary Taubes has a lot of info that might give you the answers or at least reasons for what you're experiencing.

But, first thing, stop eating those things that affect you. Then go and try to understand why. You already know what to do, based upon your list. Easy hints on implementing that in your life are at robbwolf.com and whole9life.com and many, many other paleo/primal sites.

Good luck!


on February 19, 2013
at 09:55 PM

"You already know what to do".


on January 22, 2013
at 05:32 PM

You might want to consider histamine intolerance (especially since you mentioned that anti-histamines provided some level of relief)

While researching similar issues to you, I saved my web clippings in this evernote notebook, which I made public:


Let me know if any of this sounds relevant),



on January 08, 2013
at 12:31 PM

You could get a test for food sensitivities.

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