A 300lb guy lost 100lb easily doing the 16/8 intermittent fast for a year.
The 16/8 is easy to do, and is catching on in popularity in the regular world.
People with full time jobs, they report healthier weight and better energy throughout the day.
https://www.cnn.com/2019/08/26/health/intermittent-fasting-jared-sklar-wellness-live-longer/index.html
For comparison to the 16/8, monks, nuns, yogis keeping 8 precepts are doing 20/4 or 19/5 intermittent fasting easily.
If you eat healthy food, you can eat as much as you want, never feel nutritionally deprived, doing 19/5 intermittent fasting, it's pretty much impossible to have unhealthy weight (assuming no unusual health problems).
There's a large number of yogis and monastics who have been doing this long term that are a testament to this, and it looks like health conscious worldlings are joining the party.