Generally, you can't blame them for preaching common sense and motivating people.
I am not so sure about his health stuff. The man is simply passing through uncharted territories. Cutting down on sugar and eating less carbs cannot do harm to anybody. If you eliminate carbs significantly or completely then you will need to eat other foods, and which foods are you left with? it was not long ago when I read studies about strong correlation between eating meat and colon cancer. What else you are going to eat on low carb diet, if not fat and meat?
Should I dismiss all these studies and go low carb and high fat because he says so?
I tried but never could stay on it.
For me it is eating moderation and physical activity. The health receipe known for ages.