I had to track my physical inputs and outputs for a week for medical reasons and I used a google form. I placed a shortcut on my phone and it immediately opened the form for simple and easy tracking. Everything was then saved to a spreadsheet, which I could analyze once my week was done.

I've wondered if a camera you "show" your groceries to as you unpack them would be enough to track incoming items accurately.

Or a couple of cameras around the kitchen, with an ML setup that recognizes both incoming food items, and their use in cooking. Then it could give you notifications/calendar items on things expiring :)

how do you buy your groceries, I wonder if a solution that scans the receipts might be better lol

My grocer emails a receipt, so it's even better, lol. Although at the store they print out a short receipt with nothing on it, and I had that in mind when thinking of the "ML scanning groceries" bit. whoops!