By Elisha McFarland(NaturalNews) Few people are familiar with the term nightshades, and many will be surprised to learn that consuming foods from this plant group may be contributing to their pain and inflammation. Nightshades belong to the Solanaceae family which includes over 2,000 species. They include some of the most popular foods consumed today, such as tomatoes, potatoes, all types of peppers, and eggplant. Not truly nightshades, blueberries, huckleberries, goji berries and ashwaganda contain the same inflammation-inducing alkaloids.One of the major problems attributed to nightshades is arthritis. Statistics from a 2007-2009 study show that arthritis affects 49.9 million people in the United States alone. Some researchers believe that arthritis is often misdiagnosed in people who may in fact be experiencing the side effects of nightshade consumption. Many who suffer with arthritis or an arthritis related disease such as lupus, rheumatism, and other musculoskeletal pain disorders, have found that consuming foods from the nightshade family is in fact adversely affecting their health.Norman F. Childers, PhD, founder of the Arthritis Nightshades Research Foundation states: "Diet appears to be a factor in the etiology of arthritis based on surveys of over 1,400 volunteers during a 20-year period. Plants in the drug family, Solanaceae (nightshades) are an important causative factor in arthritis in sensitive people."