My understanding is that we want to have good metabolic flexibility, where it is easy and normal for our bodies to use stored energy (fat cells) instead of the glucose/glucogen (carbs) thing.

Some people achieve this via low carb diets and keto, but intermittent fasting is also a good way to do it.

I've been on the one meal per day thing for years.

I'm approaching 50 and have a physique comparable or better than most 20 year olds.

So while it's a data point of one, I can say that it works very well for me and I enthusiastically recommend it for multiple reasons, not just bodybuilding.