I replace my breakfast with the Shakeology shake, it fills me up pretty good and last me until lunch time. I usually put in some fruits to make it last a little longer as well as change up the taste a little, driniking the same taste shake every day can get a lil boring. I ve tried many different shakes from Herbalife to other meal replacement shakes, but the one i find fills you up the most and actually helps me lose weight is the shakology shake, most other shaked either gave me the munchies or i was hungry about 30 min after drinking the shake. I already lost weight and it also increased my energy level.