Gwyneth Paltrow is a college drop-out who has zero training or credentials in business or marketing, yet she has been so successful with her GOOP company that MBA programs should bring her in for seminars. She isn't formally trained in human health either, and she's apparently influential in that field as well. She's a pretty badass person that is doing what they want to do.

A lot of people will trust a POSITIVE not to mention attractive person a lot more than some random scientist who is telling them that every single thing they enjoy will kill them. Science is constantly throwing so many threats to people's well being out there that people start rolling their eyes. "That too?" Dr. Neverheardofthem PhD, LMNOP from the Neverheardofit University, Randomrichguy School of Sceince Stuff doesn't hold any special weight with most people. They're just another person who has an opinion. Being scientists doesn't make them magically right.