Can you just take protein shakes for a diet?

Alright, i dont know anything about fitness, im not the fittest guy in the world but im above average when its according to fitness.

Anyways, i just saw the "Spartacus Boot Camp" , if you dont know Spartacus is a tv show like a gladiator thing.

So i saw this video on youtube , and i heard from them, that their diet consists of 4 protein shakes a day with like every shake having a piece of banana inside.

And from what the guys look like in the show, i say that its a pretty good diet. But is it advisable though?

And im 17 by the way, 166 cm 115 pounds/ 55.5 kg

So yup, that is all, im looking forward to finding out the answer for this as if it is alright to do this sort of diet i am trying it out.

Your body doesn't mean only muscles. You can't torture it like that. One shake a day is enough , the rest of the protein you must get from 4-5 well ballanced meals a day which should be meat/eggs/vegetables/fruit/cereal etc. I am not an expert in the protein powder thing as i never had any in my life but i have a strict bodybuilding nutrition and i have great results without it. Good luck!

Assuming the shake had everything you need in it than ya but you would probably have to make it yourself.

I have tried the taking 3 meals regulary and 3 as shakes and had to stop because I never felt full. all the ligued in my body just made me continuely have to pee. Now I'm just trying to drink a shake maybe 1-2 times a day max to stay fuller.