Whether or not a person gains weight from drinking Ensure depends upon the individual's body type, activity and diet. Ensure Plus is specifically designed to help gain or maintain weight.
Ensure was developed in the 1970s as a nutritional supplement. It contains essential vitamins and minerals as well as protein and calories. It is often recommended as a meal replacement or a supplement for people who are malnourished or those who are unable to eat solid foods.
In addition to Ensure's Original formula, a product labeled Ensure Plus was developed specifically for people who are trying to gain weight or stop losing weight. Ensure Plus contains 350 calories and 13 grams of protein. The Ensure brand also includes nutrition shakes created for people who live an active lifestyle and need to increase their protein intake.