I ate once a day for years. You can easily ignore hunger, but your body/brain isn’t going to preform as well.

It’s like being mildly dehydrated or sleep deprived, yes you can still function but no it’s not optimal.

I feel lethargic after eating. I find it hard to concentrate when hungry. I'm only productive in those 1-2 hours between the brain fog wearing off and the next hunger wave coming on.

I tried the meat diet for a few days (yes, I know that's too short! I couldn't get through the "keto flu") and I was blown away by how stable my mood and energy level was after having steak for breakfast. I wouldn't get hungry at all for the next 8-10 hours.

I tried multiple times 1-4 days around 25 - 23 years ago and

1. I didn't feel hunger and I don't think everyone needs to feel it

2. I focused a lot better,

I would probably do it a lot of I lived alone.

In practice I often end up with some kind of intermittent fasting: skip meals between 1700 and 1200 (lunch next day) and even then I happily minimize my lunch.

It helps me.