[quote=@Thundercrash]
<Snipped quote by Fallenreaper>

http://forum.bioware.com/topic/319407-dextrolevo-food-split-makes-no-sense/ I don't know how accurate this guy's science is, but I do know that food and nutrients are a lot more complicated than one would think. I imagine that it's just hard to create non-Earth sentient species, since it's so heavily dependent upon the environment they evolve in.
[/quote]

The thread is an interesting read, the writers did their best to cover their bases when created new species. I can only imagine what will be waiting for us in Andromeda :>.