Very surprising that Fitday has never responded to all of these requests over the years for sugar. However I thought I would mention that I did get a response way back in 2006 when I emailed them about it. For the benefit of all and for what it's worth, here is what they said.
"Thanks for the question. FitDay currently doesn't track sugar. The databases we
use, primarily from the USDA, didn't have complete info on sugar content in
foods. Because of this we couldn't accurately report on sugar intakes. It's a
common request to track sugar, and we're looking into it for a future version."