Have been exposed to some. I like all kinds of vegetarian food. They advocate 1. Have a diversified diet. 2. Oil-free cooking. 3. Low sugar. They strongly oppose "junk food" including high-sugar drinks and snacks with high sugar, high salt and high starch. 4. Organic food. Eat more raw fruits and vegetables.
If you look for "2 1 day health challenge" on the Internet, it is organized by a medical group advocating vegetarianism in the United States. All the recipes he provides conform to these principles.