Hard (both in difficulty and must-have) requirement: ability to exclude foods high in Vitamin K.
A lot of us are on blood thinners (anti-coagulants, anti-clotting, Coumadin/warfarin). Vitamin K is the essence of blood clotting (coagulant, thickener); high quantity or wide variation can be dangerous (first symptom: stroke). Creating an interesting diet consistently very low in Vitamin K is important. Ability to specify "Vitamin K between X and Y micrograms/day" would be very helpful.
To generalize from this very good point - perhaps a future iteration should include a fully-blinged-out "Advanced" settings menu that lets you add constraints for a wide variety of dietary restrictions, including micronutrient requirements, food allergies, and various modes of vegetarianism.
I also need to monitor my vitamin K because of blood thinner. As I mentioned in another thread, I wrote cookingspace.com for my own use just to learn how to estimate vitamine K in my diet.
A lot of us are on blood thinners (anti-coagulants, anti-clotting, Coumadin/warfarin). Vitamin K is the essence of blood clotting (coagulant, thickener); high quantity or wide variation can be dangerous (first symptom: stroke). Creating an interesting diet consistently very low in Vitamin K is important. Ability to specify "Vitamin K between X and Y micrograms/day" would be very helpful.