He's actually right about it being auto immune but that said we can just say toxicity because that is what is causing the auto immune condition. The raw living foods diet provides the nutrition required to return the system to a balanced state. It can be helped along with cleanses and detoxification methods.
One thing that is important in many diseases is resetting the amygdala. Look into this. It is an important part of the limbic system of the brain and is the circuit that operates both consciously and subconsciously in identifying threats, When it is set to improper informational feedback it can be a huge reason why people don't get well on any diet, even raw. When functioning on faulty info it is an internal source of stress. It needs to be reset in many cases.