One of the theories behind what causes RA is that it may be caused by a "leaky gut"...perhaps you had severe diarrhea, colitis, ulcers, parasites, or surgery that negatively affected the health of your colon, large and/or small. If the "good bacteria", which gradually die off over the years because of the medications we take, illnesses, etc., have left your colon walls susceptible, the food waste bacteria will come in contact with the colon in such a way that it can penetrate the wall and get into your bloodstream. That theory fits my history to a T (I had sudden loose stools, lasted a full year, drs said it was stress or lactose allergies...colonoscopy finally determined the presence of GIARDIA. After a year of this issue, I started having joint flares, and voila...here I am with RA now. The Giardia have been killed off, the damage to the intestines -scarring in multiple locations - cannot be repaired. So I take probiotics to help replenish the "good bacteria", but my dr. told me that I will have to take the supplements and yogurt etc. for the rest of my life, because the replenished bacteria do not STAY in the gut permanently, like the original colony did.). ANYHOW, regarding FOODS...one thing I figured out quickly once the RA diagnosis was confirmed was that certain foods triggered strong flares. My particular poisons are pork, peanuts, popcorn, tomatoes, bell peppers, sunflower seeds, strawberries, among others. I am not a chemist, but I am thinking there is something about those foods that makes them more likely to easily penetrate the colon walls. Funny that many of those foods are ones that lots of people are allergic to. I happen to take antibiotics to control my RA...minocin. And I am 99% symptom free about 90% of the time. Recently I had some minor surgery to remove a kidneystone, and after the surgery was given an antibiotic to prevent infection. I became extremely ill from that antibiotic (I had suspended my daily 100 mg of minocin) and was bedridden for 4 days, sick as a dog from taking those meds for just one day. Once I revived, and felt healthy again, I started having RA flares. So I had to double up on the dosage for several weeks, and now am back down to my normal dosage. During those weeks, I again had to be very careful to avoid the flare-triggering foods. I discovered that gluten was also one that caused flares. (I can tell that a food causes a flare, because the flare will start 2 hours or so after eating that food). Once I get totally re-stabilized (giving it another month with restricted diet) I will be able to eat any food (in moderation) without difficulty. But yes indeed, different foods will definitely have an impact on RA flares and the intensity of flares. see my blog at ra-fighter.blogspot.com for more information about my journey...now 6 years of RA