Supposedly, meal replacement shakes contain everything a human being needs to survive (par water). Carbs, protein, etc. You can control your calorie intake by changing how much you drink.
In theory, it's the perfect diet and definitely better than starving yourself to lose weight (something I am guilty of doing in the very recent past). I also imagine it cuts down on the stress of finding healthy/exciting meals every day, saves cooking time, and fridge space.
I'm considering using shakes in place of meals once at university. It should make life easier since I'm trying to lose fat and bulk up too.
But can a human really survive on nothing but shakes? Will the digestive system suffer from a lack of solid food? I don't want to mess up my body trying to be healthy.