Weight / Fat loss

Cheers,

Another dumb question are the diet / fat burning protein shakes any good? Was told by a mate to stay away from them as they are loaded with caffeine (large amount of caffeine + me = bouncing off the wall and angry girlfriend) to up your metabolism but he frequently talks shit.

I find they are great, the promax one as long as you only use 2 scoops as opposed to 2x 2 scoops (I'd be buzzing) I take one for breakfast and it keeps me full until lunchtime.