what is the theory behind slim fast? Why do we have to drink the milkshakes? What is the difference between having a 1000 kcal diet eating muesli for breakfast, low fat sandwich for lunch and low cal dinner adding to 1000 kcals Or doing slim fast where we have 2 shakes and a dinner adding to 1000 cals> is the whole theory behind slim fast, the fact that the shakes digest quicker because its liquid and makes digestion faster so you get quicker loss?