Sounds like a concept the author has plucked out of the air. No science behind it.
While I agree that the 80/20 approach works for many, we have to recognise that we live in a culture of processed food, completely unlike the food culture in which these gritty grandmas were raised. We need balance which means both types of food nazi (those who say you must have whatever shit they offer and those who abuse anyone who offers them shit) need to be put in their place and let everyone get on with their choices
Four years Primal with influences from Jaminet & Shanahan and a focus on being anti-inflammatory. Using Primal to treat CVD and prevent stents from blocking free of drugs.
Eat creatures nose-to-tail (animal, fowl, fish, crustacea, molluscs), a large variety of vegetables (raw, cooked and fermented, including safe starches), dairy (cheese & yoghurt), occasional fruit, cocoa, turmeric & red wine