Not sure if this has already been mentioned, but the day doesn't account for different time zones.
When creating my own foods, it's a little annoying that the default measurement is in grams. It would be great to be able to select an althernative measurement.
Also, for me today has already been the 27th for nearly 14.5 hours, but if I add foods to 'Today' they're still added to the 26th. And I can't add them the the 27th as it isn't available to be selected.