The nanny probably gave the kids two eggs because one was not satiating enough to keep them from craving sugar.

Yeah, you're right. But I think they should do an adult experiment too just so it doesn't become a special thing to feed the kid eggs while the adults eat some kind of "normal" crap, you know? If it's good for the gander it's good for the goose, that kind of thing. Also it's just easier to make the same meals for the family instead of some gluten-free for one, some low-carb for another, some veggie for yet another, some keto, an egg for the kid, etc.

Granted, the adults should be eating eggs too - but not for growth, which was the entire purpose of this particular study.

For adults, a good study would be to determine if eggs are more satiating, or whether they help prohibit weight gain.

Unfortunately, most studies regarding eggs are too frightened to try more than one egg/day, at most, due to cholesterol issues. (*huge eye roll*) And that's going to seriously limit satiety, as well as limit the egg's ability to inhibit weight gain, since they'll be eating it with toast, cereal, skim milk, fruit juice, etc, just to feel reasonably full.

If they'd try 2-3 eggs for breakfast, cooked in a decent amount of butter, skip all the carby stuff (or at least hold it down to a relatively minimal amount of carbs - a lot of people could easily handle the 12-15 carbs in one slice of toast), and study egg consumption that way, they'd likely find that most people weren't even hungry by lunchtime.