Are they on a diet?

I’m finding that the food i'm giving the worms isn’t being consumed nearly as quickly as I imagined. Perhaps its because it is not chopped up fine enough (therefore slower digestion) or maybe some of the food is just too hard for them to crunch down quickly? Either way i'm reluctant to keep loading waste into the bin if its just going to sit there and not be decomposed. Maybe I will feed once or twice a week rather than every day and see how it goes.

Added: rosehip infusion tea leaves, normal tea leaves, parsnip peelings