How to divide food budget when partner eats so much more?

Hi everyone!

Not sure if this is the right subreddit for it but I'm hoping you can help.

I've been unemployed for around a month and am not receiving any financial aid from the state where I live due to ineligibility. I have savings so I'm not very stressed at the moment but one thing I'm trying to navigate is the food budget I have with my partner.

We don't limit ourselves with what we buy at the supermarket, we love food and eating so that is a hard line I draw. We also buy our groceries at budget supermarkets like Lidl and Aldi. The thing is my partner eats a lot more than I, I'd say he probably eats on average a little less than double what I eat since he works out a lot, sometimes even double.

He agrees that since I'm not secure financially right now, he can pay more of the food budget but I want your advice on how to go about this practically from those who have experience? Should he just pay a food shop every now and again and not put it on Tricount or should we do something more calculated?