I know it's probably not meant to be used like this, but can you use Slim Fast like The Cambridge Diet, i.e, have 1 SF for breakfast, 1 for lunch, have a small meal for dinner and then another SF for evening ?
SF is not a VLCD diet and shouldnt be used like one.
If youre doing SF you need to do it the way its meant or alternatively why not just go back to a VLCD.
If you can manage on shakes and a high protein meal why not do a VLCD, that way you get the benefits AND the higher weight loss. SF losses arent the same as a VLCD either