Getting leaner/skinnier?

Hi all,
Debo is on raw diet for abot 3 yr now, he loves it, so do we. He weighs 17,8kg and gets 550g a day( so over 3% of his body weigh). We recently noticed that he's hungry a lot and looks a lot skinnier, mind you his weight stays the same. Any ideas what could cause it? He's fine in himself, happy bunny, poo is normal.

Has he been getting more exercise? Don't forget that muscle weighs more than fat, so if he's putting on muscle he may look slimmer but stay the same weight.

More the opposite. He has problem with his hip so on colder months we exerice him less

Just to check, is he regularly wormed?

If this is a change to normal and he's looking a lot skinnier although nothing in his feed or other has changed, it's probably worth a quick checkup.

I'd worm him (good quality wormer) and if that doesn't make any difference, then a trip to the vet.