Why do eggs keep some people fuller for longer?
Largely down to how the body signals hunger and fullness. Protein-rich meals generally leave people feeling more satisfied than lower-protein meals of a similar size, although the strength of that effect varies from person to person.
"Some people," in the question, is doing real work too, and it's worth being upfront about why: those signals don't fire identically in everyone. Body composition, activity levels, and plain individual variation all affect how strongly someone registers the same meal, not unlike how some people feel one coffee's worth of caffeine intensely while others need three to notice anything.
That's not a reason to expect everyone to respond identically. If the effect feels less dramatic for you than it does for someone else, that may simply be ordinary variation. And some people may notice very little difference at all.
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