Originally Posted by a bear
IMO, slimfast is not good nutrition. water, 10 grams of protein and alot of sugar.
I sure agree. In fact of all the liquid "meal replacements" on the market, slim fast is among the closest to empty calories. Sugar, sugar, sugar.
There are many brands,nitrotech, myoplex, pure protein, atkins, others who make much fuller meal replacements with much less sugar.
Yes, if you go on a strict calorie reduction (the slim fast diet is about 900 claories a day, yes?) diet and exercise that much you will risk some muscle loss. You can reduce this somewhat by concentrating whatever nutrition you do get around the work out periods, and emphsizing extra protein in whatever calories you do take in.
Depending on whether you are more concerned with staying strong or losing size, you might put more exercise emphasis on resistance training or cardio respectively.
But it is very hard to go on any low cal regime and preserve muscle. Not impossilble, but difficult.