Just do whatever the fuck you want, even in front of them. They honestly can't force you, their agenda is dumb as fuck.
Just "come back late from work" eat outside with friends Or buy some mnms, 1 pack can hold you for 5 hours (I know that from Yom Kippur).
They both are stupid things that should have never exist. I mean wtf? You can't eat during the day but at night it's dark so good can't see you eating?