"Intermittent fasting", as the above poster called it, is a trendy thing in dietary circles at the moment. So, like a million other trends no one actually knows if it's a real thing or not. When all is said and done there will probably be a few cases, for a few people, who live a particular lifestyle, where it will be of a help. I don't expect that there's a dietary revolution in the offing.

And yes. She's marketing herself.