Been a while since I posted here, but I whizz mine up in the food processor so it gets lots of air bubbles in it and goes nice and thick, then I drink it through a straw. The work of drinking through the straw makes it take longer and feel more like hard work than just gulping it down. Although it makes me burp, I find it fills me up more because of the air in it, so I stay satisfied for longer. I like to take my time over it, but still drink it before all the air bubbles go.
Works best with Tesco chocolate flavour which is my fave and comes up nice and thick.