What's a good diet? What do you think of the celery diet?

The only reason the celery diet works is because it takes more calories to eat it than you gain. This is due to the fact that celery is almost entirely water and its stringy texture means you'll have to chew more than you might for a normal food. So this is essentially starving yourself. Try fresh fruits and working out like everyone says you should, its really the best way. No pain no gain