I'm going to make a spreadsheet of how much my boyfriend eats when he's at my place
How did you come to this conclusion?
We had an argument about him eating to much at my place.
You should be thankful he likes your food. I guess you are a great cook. So when can I come over and eat?
I won't be letting you near my kitchen.
It is rude if you make a spreadsheet to follow someone's eating for non medical purposes. Have you considered how freaked out he might be if he found out about it? If money is tight you should tell him you cannot afford groceries and to help you out.