We're sorry, but that's currently not possible due to technical restraints on our vast database. We know this is a feature that you're interested in and we hope to offer it as we continue to grow. As a young company, we're working hard to fulfill our first commitment as a social food app to help you share your eating preferences with others.
In the meantime, here are a few workarounds that we hope may help.
If there are foods you really want to minimize eating, one way is to list them under foods you avoid so others will be aware.
If you're creating a Group or Event, you can communicate to others any quantity restrictions by putting this information into Notes (e.g. low salt, small portion, etc) then sharing Notes with others.
We hope this helps!
Oliver @ SelectivorSelectivor is how we eat together.