So this is different than Slimfast -- how? From what I understand, Slimfast is pretty close to a meal replacement. Or is this intended to be in the same category?
Slimfast and other similar meal replacements (like Ensure) are not really balanced for normal, active people. They're meant for people who want to diet or are unable to eat solid food.
> [...] meal replacements (like Ensure) are not really balanced for normal, active people. They're meant for people who [...] are unable to eat solid food.
Ensure (etc) are aimed at medical uses. That's because most people find the idea of liquid feeds weird.
But if you want to live on liquid food there's nothing to stop you using Ensure, even if you're a fit healthy active person.