Thanksgiving is a time for family, friends and turkey, right? Well, if you're like one of many celebrities, you may be passing on the turkey and opting for an extra helping of mashed potatoes or stuffing instead.

As vegetarian and vegan diets have become more popular in recent years, Hollywood has naturally jumped on the growing trend and a bunch of A-listers have recently made the switch , joining plenty of celebrities who have long been advocates of the meat-free life. From legends like Paul McCartney to legends in their own mind like Courtney Stodden, check out our roundup of 16 celebrities who will be having tofurkey this Thanksgiving!

What primarily vegan celebrity switches to vegetarian when he's trying to gain or lose weight? Find out after the jump!

Getting into character for a movie role isn't just about putting on a costume and memorizing lines. Celebrities sometimes need to gain or lose a couple of pounds too--or maybe 40 to 50 of them!

Matthew McConaughey recently lost 30 pounds to play the role of a character with HIV in the upcoming movie The Dallas Buyers Club, but that's not out of the ordinary in Hollywood. A-listers are often asked to go the extra mile for their mega-paychecks by gaining or losing crazy amounts of weights in a short period of time, which leads to a whole bunch of methods no doctor would ever advise! From Beyonce to Ryan Gosling, check out the 14 craziest celebrity weight losses and gains of all time!

What weight gaining actor had beer and McDonald's as a daily in-between meal while on set? Find out after the jump!