Anecdotal:

Growing up, our parents never added salt to our food, avoided as much as possible any processed foods and made everything from fresh ingredients.

After moving out and living with various people, shifting my diet multiple times, I generally feel worse now than I did before. When I fast and shift myself to healthier eating I feel better. What interests me is why most people don't feel "bad" when they're eating the food that I would feel sluggish from the next day. My pet theories are their body is accustomed to it/or they simply don't know what it feels like to not feel that way- if you know what I mean.

I thought it was self evident that anything that weakens you is likely to be bad for you.

Glad that these findings are going more mainstream.