OP, you can definitely lose weight with just one meal/day but I would not encourage this!
Eating just 1 meal/day is definitely not healthy and it can create weird eating patterns for you and also change your hunger setpoint randomly.
Marinas Florin
I am not a fat loss "guru" or something like that but I managed to get my six pack by training and dieting the right way. You can find me at http://www.nobsbb.com