But, I suppose the real question is, how many do they actually need in order to be profitable? If 1 person in 1,000 is enough, which would be 300,000+ people in the U.S., then maybe they could do all right.
Now, if some VC fund threw 50 billion dollars at them and insisted they try to grow to Facebook size, then this will never work.
I myself was pre-diabetic from the standard western diet of 2000kcal+ daily refined carbohydrates, and have pulled back from the brink by going LCHF.
Don’t dismiss it without a little bit of experience. It’s a growing movement, and it isn’t a fad. It has provided real results and real improvement to many, many people, and has spawned dozens or hundreds of successful small businesses.
I'd be interested in any sources that support that diet for anything other than weight loss - I was under the impression it led to pretty poor health outcomes (apart from bmi/diabetes management)
There is lots of published info about it. Here’s a good starting point: