[mtl_usr]

That's a shame.

Curious, how do you normally figure out the phosphorus content ? Is there a guideline somewhere that gives you an adequate estimate ?

[pkaye]

For many common food items, the USDA has a database of full nutrition information including phosphorus. This is a God send for me. https://ndb.nal.usda.gov/ndb/search/list

Beyond thing I have few tricks to get a estimate but mostly for those things I don't know the numbers well, I eat in moderation.