Is using soy flour good for people who have an autoimmune disease?

There are hundreds of autoimmune diseases and there is no single diet or individual food that is effective or recommended for all of them.

Soy flour may be a good choice for people with celiac disease because it is gluten-free (unless mixed with other ingredients that contain gluten). However, there is no reason to expect soy flour to help people with rheumatoid arthritis, multiple sclerosis or most other autoimmune diseases. Conversely, there is little or no convincing evidence in humans that consuming soy flour increases the risk of developing autoimmune disease or causes worsening of existing disease.