Clever marketing has people confused about nutritional drinks. They're notjust "health" drinks...they have specific uses.
Oral supplements such as Ensure, Sustacal, Resource, and Boost are for peoplewho don't get enough calories from food. Most are lactose-free...sweetened fortaste...and provide 1 cal/ml.
Some of these supplements are high calorie...Ensure Plus, Sustacal Plus, etc.