Nothing happens. If the day is not marked as Complete, tapping will show the nutrition info, and you can star the item - very useful for later.
You can access the nutrition information for a food logged in a day marked as complete by swiping the item in your diary to the right. From the menu, select 'Show Nutrition Summary'.
I hope that helps!
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Definitely good points I'll discuss with the other over here. I do think it prevents the frustration of accessing the screen where you can edit the serving size/timestamps/diary groups when you won't be able to use these functions.
There's always room for improvement though!
I agree, the size, timestamp and group should not be editable when the day is complete. These are properties of the entry in the day.
Whether a food is a favorite or not, is a property of the food, irrespective of any entry in a day. So I think that should stay editable, whether the day is complete or not.