There are numerous causes of sacrum, or sacroiliac, joint pain. According to the Sports Injury Clinic website, the sacroiliac, or SI joints, are located near the tailbone and connect the hip bones with the sacrum, which is a large, triangular bone situated at the base of the spine.
The Mediterranean diet is one such diet. It emphasizes grains, but also emphasizes fruits, vegetables, cheese, yoghurt, and fish, all foods high in lysine and low in arginine. This is generally attributed to omega-3 fatty acids in fish. Fish have a high lysine to arginine ratio. Dairy products also have a high lysine to arginine ratio.
There are some foods that reduce inflammation in the body and others that may make inflammation worse. Eat to Reduce Inflammation Research shows that many foods associated with the Mediterranean diet-- fish, olive oil, fruits, vegetables, and whole grains -- reduce inflammation. Although much of this research has been done in test tubes, some studies -- but not all -- have found a connection between eating these foods and an improvement in RA symptoms.