Just an idea, but it would be amazing to see some sort of 'Proton Health' or a 'Proton Diet' app/feature.

Recently I've been looking for a half decent calorie tracker app that isn't an absurd monthly subscription as well as one that is also privacy oriented - or at least doesn't sell my data to 3rd parties to better advertise to me.
I'm sure the infrastructure for this kind of stuff would require a ton of work, but there's always room for possibilities in the future :)