Disorders of the immune system are on the rise everywhere thanks to the global popularity of the so-called Western diet. Autoimmune diseases including type 1 diabetes, multiple sclerosis, rheumatoid arthritis, Crohn’s disease and ulcerative colitis have spiked in recent decades, according to scientists James Lee and Carola Vineusa at London’s Francis Crick Institute. Lee and Vineusa have devoted their study to investigating the cause of such illness, which they believe can be blamed on the recent pervasiveness of fast foods, which “lack certain important ingredients.” “Numbers of autoimmune cases began to increase about 40 years ago in the West,” Lee...