It seems like every culture expects guests to want to eat regardless of their circumstances, and if you refuse, you’re automatically rude and insulting.
If I offer you food and you refuse, I’m going to be quite happy. It means I get to save money and have more food to myself. I ain’t offering a second time if you say no the first time :maduro-coffee:
Accepting Food is pretty much a universal sign of "I wont murder you in your house" and also you never know when some guy is gonna be Odin and then you'll wish you offered them the Tea and Biscuits.