As for nutrition, we need to get back to the roots.
There were several autoimmune diseases in my family. With a rigorous change in diet, everyone today is symptom-free.
We have banned all plastics from our household, we only buy food directly from producers or grow it ourselves. Since 2 years we get water from our own well. Food as fresh and untreated (raw if possible) as possible. We brush our teeth with birch sugar (xylitol) and minerals (no more tooth decay, no bad breath, no colds). We ferment many foods and, very importantly, we fast at least once a year for 20 days.