It's not 50% more though. I track my groceries closely going back almost ten years and it's more like a 15% increase in staple items compared to 2018. Processed food, luxury meat and frozen food is like 30-60% higher (my data on this is less robust) but milk, eggs and bread is not 50% more expensive unless you are buying the most expensive options.

You can literally go look at commodity market price history. Wheat is 9% above 2018. Cheese is 6% higher. Milk +17%, rice +10%, eggs +12%.