I 100% agree - I just wanted to add that processed food also plays a huge role. Our ancestors didn't eat canned fish dipped in high calorie oils or snacks / junk food with no fiber. White bread is used commonly throughout many households but whole-grains are a lot healthier. Eating food which has a high degree of high fructose corn-syrup or sugar with no added fiber has a detrimental effect on health and is not something that our bodies are used to. The high-glycemic index spikes our bodies go through when you combine these factors does a ton of damage to our health and yes - I believe it does have a role in triggering auto-immune reactions. Type 1 diabetics as an example are diabetic due to their own immune systems falsely labelling the pancreas beta-cells as enemies and triggering an auto-immune response -- the reason I believe this happens is due to the high-inflammatory reaction our pancreas go through when we eat extremely highly processed foods (i.e. high sugar / glycemic index items with high insulin spikes & lacking fiber). I don't have a lot of data to prove any of this - so this is my hypothesis but I can confirm that ever since I started staying away from processed foods, I've been in amazing health and I feel much better than when I was slightly over-weight and consuming processed junk.