If you’ve ever tossed out a carton of milk or a container of yogurt solely because the date on the packaging had passed, you’re not alone. Many people throw away food simply because of the date printed on the label. But often it is still perfectly edible, according to experts.…
Share some facts and official advise, that should convince any reasonable person. If your region doesn’t differentiate between ‘use by’ and ‘best by’ then the website lists the foods to be eztra cautious with (e.g. meat, fish, dairy)
https://www.efsa.europa.eu/en/safe2eat/food-date-labelling
He has a lot of anxiety about things he mentally relates to poverty. When I’m making food for us, I use my own judgment, though. :p