Nightshades form a group of 3000 plants. Some of which are poisonous. We normally eat a small group of them that are not considered poisonous. In fact, they are nutritious powerhouses. Night shades include tomatoes, potatoes (not sweet potatoes or yams), eggplant, all peppers, tomatillos, paprika, cayenne, chili pepper and chilies. The group of nightshades that we eat are considered safe and are ingested daily by many of the world’s population.
There are some individuals who do not tolerate the nightshades. Like those who have lactose or gluten intolerance, those who do not tolerate the nightshades should eliminate them from their diet. If you suspect that you have a nightshade intolerance, eliminate them from your diet. If you start feeling better, you know what the culprit is and what to avoid in the future.
30-40% of people with RA are helped by using an elimination diet to determine food sensitivities.80 During an elimination diet, a particular suspicious food or foods are eliminated from the diet for about a month. Reintroducing the foods individually will see which foods cause increased joint inflammation. Eliminating the offending food or foods frequently improves RA symptoms. Milk and eggs are the biggest offenders.81 Those with RA are frequently sensitive to several foods.
My Rheumatoid Arthritis Handbook