I guess for me, since I never bought into any of the 6-8 meals a day nonsense my eating patterns were already like that. I train fasted from 7-8am, and either have a shake by 8:30-9 or sometimes a solid meal. If a shake, followed by something solid within an hour or two. And pretty much last meal of the day is at 6ish. and then nothing till the following morning after training. so to me "normal" eating is a 14+ hour fasting anyhow.
More of the studies were on non-resistance trained people, I think there was one or two. From memory, since it was a couple years back when I looked at it, the more significant biological marker changes started at 18 hours fasted and improved all the way out to 40 hours fasted. Growth hormone levels and insulin resistance primarily from what I recall.