Ensure TwoCal is a nutritionally complete, high energy, high protein nutritional drink, designed for people with involuntary weight loss, those who are recovering from illness or surgery or those who have increased nutritional needs. Ensure Two Cal Banana is the highly nutritous high energy and protein drink. It is designed for people with involuntary weight loss, in particular recovering from illness or surgery. It pr s 2. 0 calories per ml to help gain a healthy modified weight. The high concentration of proteins helps repair and maintain muscle tissue. It is suitable as a supplement with meals or as a snack between them.