By consuming too few calories to support your energy needs, your body thinks that it’s starving and slows down its metabolic rate
A liquid diet made up entirely of fruit and vegetables has got to be the most efficient way to lose weight, right? Hmmm, not quite. Turns out, whatever weight you lose, you'll put back on as soon as you start eating solids again (usually after five days).
You’re also doing your body a huge disservice by trying to lose weight that way. By consuming too few calories to support your energy needs, your body thinks that it’s starving and slows down its metabolic rate (the rate at which you burn calories). So not only do you put of the weight when you start eating solids again, but the rate at which you burn them off is slower than before you were on the diet!