I've been using it daily for over a year now. It can't replace a meal; however, it cuts hunger for 3-4 hours maybe. Using it to fast requires adding fiber. I used to be able to feel it when I didn't drink it for a few days; my better overall diet is probably why. It provides more than I'd eat normally; and some foods I'd not eat; it's the cheapest and easiest way to eat many organic foods. I tasted many and this was the least horrible drink I found. Now I actually like it (except the texture which can't be helped and is not a big deal.) I just add water; but milk or in a shake works fine. Check the label and compare it to others - it beats everything I've looked at so far even if it wasn't #1, it just tastes better. (vanilla flavor)