It's simply not a balanced diet. It overloads your kidneys, and you discussed the acidity thing yourself. So if you are really healthy, you won't actually die of it. But why would you want to do that in the first place? If you wanted to lose weight in an unhealthy way, you could just cut the fat off your body.

I assume you want to be healthy. So have a balanced diet. Weight Watchers, although unfashionable, offer good ones, as well as a nice way of calculating how good for you that next thing you want to eat is. Have a nice balanced diet, eat lots of roughage (it makes it easier on your other end), and exercise. No, climbing stairs once a day - unless it takes you 45 minutes - won't do the trick.