IMO Ensure (250 calories a can) will not cut it. Try Ensure Plus (350 calories a can) or VHC (560 calories a can)by Carnation. After my surgery, they gave me a prescription for Jevity 1.5 (355 calories a can)so insurance would cover it. However Jevity can only be tolerated with a feeding tube since it's so bad, it makes the chalky VHC taste like the nectar of the gods. It's terrible when you can not speak or swallow.
hang in there.
Charm