How much weight would i lose if i only have vegetables for 30 days?

Answer 1

a fair amount,you'll be sick of it after a few days.

Answer 2

That would be a bad idea. You need to diet under supervision, so that you get all of the foods that you need in smaller quantities.

You'd do better just to swear off carbonated drinks for a month, They are packed with sugar, and even the diet ones are not good for you.