What would help me is if it were easy to track this stuff. When I get the receipt at a restaurant, why isn't there a nutrition label printed on it, like the on

What would help me is if it were easy to track this stuff. When I get the receipt at a restaurant, why isn't there a nutrition label printed on it, like the ones in grocery stores? Why aren't there QR encodings of nutrition labels for easy scanning by your choice of tracking app? I see opportunity for improvement here :)