Working back of house food service? Standing on your feet all day? High stress environment? 16 hour shifts? Tasting things constantly but never actually eating a meal?
From personal experience I can tell you, the combination of these is the best diet in the world, you have to eat like 4000 calories a day just to stay a stable weight. I lost 10kgs a year doing my apprenticeship.
You get paid to lose weight, but as with all intense diets it takes a toll on the body. Particularly if you're a saucier and tasting sauces all day, your mind gets very confused as to how much you've eaten.