More interesting to me is why someone would phrase it as a guarantee even if it were true. It suggests that the reader likely hasn't tried it, and would be surprised to discover the result.
Yeah no one likes your humble brags about how little you eat and feel JUST GREAT. You're probably worse for it.
I'm 5'11", ~170 lbs and rather lazy right now, running ~15 miles a week and a couple light lifting sessions because I'm busy. I eat 2500 calories a day and maintain just fine.
I just ate 1200 calories at dinner, no problem, so I'm going to try real hard not to feel judged by you!
I just wonder do any of these people actually move? Apologies if you're less-than-abled but good lord, if you're not and you're surviving on so few calories, I just wonder if you're moving enough to actually be healthy?? Thin !== healthy, necessarily.
I don't understand the motivation to make such a guarantee. It's as though you assume there are many people on HN who have never tried eating two eggs in the same meal. Do you maybe live in a place where eggs are rare (or not commonly eaten)?
(For what it's worth, my personal experience matches that of others here: two eggs would be a comically small breakfast.)