How should I use Glucerna? Glucerna health shakes can be used in place of a skipped meal, or to replace an unhealthy food option. For lunch, you might have a salad plus a Glucerna health shake. Have a Glucerna shake for an afternoon tea snack. For dinner, try one of our simple, healthy and delicious recipes using Glucerna. For people with diabetes who need extra calories and protein (such as those with, or at risk of, malnutrition), Glucerna shakes can be used to supplement their diet with additional nutrition to help meet nutrient requirements. Your dietitian can help you determine how to best incorporate Glucerna into your diabetes meal plan.