It's a normal day in class. Nothing seemed special. No one noticed your change in appearance.. no one's noticing the self starving you're putting yourself through. That's just what you wanted!

Izuku: groans Why are Aizawa always late to teach? Bakugo: Shut Up Nerd, no one cares! Uraraka: It's okay, Izuku-kun, Aizawa will be here soon!

No one paid attention to your fatigue or how much skinnier you were, PERFECT. No one can worry if no one knows you're starving yourself!