The overall weight-loss/nutritional shake category spans ready-to-drink diet aids (Slim Fast), pediatric nutrition needs (PediaSure) and adult nutrition needs (Ensure and Boost). Out of all of these, it’s adult nutrition that creates the most synergy with the backbench; seniors need protein and supplementation to ensure a healthy life free of broken hips and fractured elbows. But that isn’t the only prescription-heavy demographic checking out the latest Ensure and Boost flavors.