[quote=@Naive1]
<Snipped quote by TheGrundlesnart>

It would severely depend on his down diet, and if he is eating properly if I'm being perfectly honest, seeing as she can only gain nutrients from said blood. But overall, taste-wise it's just blood but if she goes for too long without feeding she can kinda 'get lost' I mean, imagine not eating for a week+ and suddenly being offered a buffet, easy to lose control. 
[/quote]

He eats mostly meat, but he eats his prey whole, so... it's probably no different from just sucking the blood out of the original critters. If you literally wholesale absorb an entire cow at once... you'll probably have a lot of nutrients in there. He can absorb plant material just fine as well.