As 'The Big Bang Theory' rolls into its final season with fans grabbing their tissue boxes due to this emotional farewell, it is a good time to remember how a number of the cast members have gone vegan due to their undying love for animals. 

Mayim Bialik who plays neurobiologist Amy Farrah Fowler is also a real-life neuroscientist. Mayim is also a vegan activist and the author of cookbook, 'Mayim's Vegan Table.' Her book features around 100 plant-based recipes. 

Alongside her is Sara Gilbert who is a native of Santa Monica and plays the role of Leslie Winkle, an experimental physicist. Apart from that, she is also known for playing Darlene on the ABC sitcom 'Roseanne' and its spinoff 'The Conners.' Gilbert has been a vegetarian since she was 13-years-old and switched to a vegan diet a couple of years ago. She is also the author of 'The Imperfect Environmentalist: A Practical Guide to Clearing Your Body, Detoxing Your Home, and Saving the Earth (Without Losing Your Mind)'.

Kaley Cuoco, who plays the role of Penny in the show is also a vegetarian and an animal lover.  Last March, she even appeared in a video to encourage pet adoption for the California-based nonprofit Paw Works. She also campaigns against the Canadian slaughter of baby seals. In the October 2015 issue of Shape magazine, the star also revealed that one of her favorite dishes is pasta with vegan butter and veggies. 

Johnny Galecki, who plays the role of Leonard, best friend of Sheldon and husband of Penny has also been following a vegetarian diet for health benefits for several years now. In an interview in 2012, he told TV host Conan O’Brien that he has purchased a 300-acre plot of land in Central California. “There are some vineyards on it,” he continued. “I felt like if you’re going to have that kind of land, it should function somehow. I’m not a horse person, and I’m a vegetarian so livestock was out of the question, but I do like wine.”

Apart from the cast of TBBT, dozens of other celebs have also gone vegan in the past few years. They include Casey Affleck, Pamela Anderson, Alec Baldwin, Bob Barker, Beyonce, James Cameron, Jessica Chastain, Miley Cyrus, Ellen DeGeneres, Emily Deschanel, Peter Dinklage, Sara Gilbert, Ariana Grande, Daryl Hannah, Woody Harrelson, Anne Hathaway, Jennifer Lopez, Madonna, Tobey Maguire, Demi Moore, Michelle Pfeiffer, Joaquin Phoenix, Brad Pitt, Natalie Portman, Alicia Silverstone, Stevie Wonder.