A page providing a table of conversion factors for important medical units from US units to european/canadian units would be helpful. I am thinking cholesterol (38.7?); triglycerides (88.4?); glucose (18?); insulin (6.97?); CRP (1.00?); HbA1c (1.00); and so on. Not complicated, and people would know where to come to find them, rather than having to search the web.
Also, you provide a prompt when someone modifies information for a non-current date. Good. But how about instead plonking a large 'NOT TODAY' in pale red in a prominent spot on the page when a non-current date page is on the screen? That way one does not need to reply to it each time the warning shows! Just a little more user friendly - less clicking to do! (I like to plan foods a couple of days ahead.)