My wife has a bunch of food allergies, and it’s my understanding that this is fairly common with people who have lupus. She’s allergic to nuts, melons, avacados, and quite a few other foods, but those are the big ones that we have to watch out for. It’s the nuts that are the worst, just because we never have nuts around, and I love nuts, especially walnuts.

Just a short online search revealed a very interesting link to a web chat transcript on The Lupus Foundation of America site. Dr. Laura Coleman is a registered dietitian, and had this to say in response to a question regarding specific foods causing a lupus flare:

As for whether there are any specific foods that trigger a lupus flare, the answer is unfortunately rather vague. Some foods may trigger a flare for some people but not others, and some people may not have problems with any foods at all. That being said, patients can pay attention to their diet, and if a specific food is suspected of triggering a flare, they should require that a pattern of ingestion followed by worsening occurs at least 3 times before eliminating a food from the diet. Even if it appears that a food is causing some trouble, it could be that another factor, such as the source of the food, use of chemicals or other preservatives, or even the interaction of several foods, is the problem.

I recommend that you read the entire transcript, which is available here.

I also found a very helpul site on Food Allergy, which offers some useful advice.