Hello FitDay,
this seems to be an issue that doesn't want to go away, judging by the number of related posts.

When I enter values for my food/supplements or whatever, I enter Daily Values.
FitDay then makes an absolut weight out of this, customizes it for my parameters and displays my RDA.

I understand this, but handling it, as a user, is really annoying!!

Currently I have to guesstimate my %DV until I get the correct value under Total Nutrition as RDA. Because the total weight is the same in both!
This for every single vitamin or mineral.

For example, if I could just add the total weight of something (in mg, mcg, etc.), as I often could with supplements, then Fitday wouldn't have to do all these calculations and the user would be less confused.

Suggestion:
In the creation of a custom food allow entry of EITHER the %DV OR the total weight of the substance in question.