Do You Know Leonardo Da Vinci Was A Vegetarian?

Do you know which Writers, Philosophers, Scientists whom are vegetarian? If you do, please add more to my lists, so others can read and be proud of their idols.

Alan Moore (a writer - his works included Watchmen, V for Vendetta, From Hell, The League of Extraordinary Gentlemen, Miracleman, Swamp Thing
Alan Watts (British philosopher, writer, speaker, and student of comparative religion)
Albert Schweitzer (a philosophers - won Nobel Peace Prize in 1952), died at age 90.
Alice Walker
Amanda Feilen
Benjamin Spock (Pediatrics, died at age 94)
Berke Breathed
Carla Lane
Chandrashekar Subrahmanyam (Nobel Prize, Physics (1983), died at age 84)
Charles Darwin
Charlotte Bronte
Clive Barker
Colin Spencer

Ed. Diana
Emanuel Swedenborg
Ferriére
Franz Kafka
George Bernard Shaw (won Nobel Prize in Literature in 1925, died at age 94)
H.G. Wells
Henry David Thoreau
Henry Heimlich M.D.
Isaac Bashevis Singer
Jean Jacques Rousseau
Jeremy Bentham
John Robbins
Krishnamurti Jiddu
Leonardo Da Vinci (a scientists, drew Mona Lisa picture, died at age 67)
Louisa May Alcott
Mark Twain
Milton
Nikola Tesla
Percy Shelley
Peter Singer
Plato
Ralph Waldo Emerson (Western Philosophy in 19th century, died at age 78)
Ruth Rendell

Scott Adams
Serge Raynaud de la Ferriere
Sir C. V. Raman
Sir Isaac Newton (is a vegetarian physicist and mathematician, quite a handsome man if you see his picture, died at age 84)
Socrates
Srinivasa Ramanujan
Steven Jobs
Thomas Edison ("Genius is one percent inspiration, ninety-nine percent perspiration." - Thomas Alva Edison, Harper's Monthly (September 1932), died at age 84)
Tolstoy
Upton Sinclair
William Blake
William Wordsworth (Romanticism, died at age 80)

Why are these genius people so genius and become famous? Is being a vegetarian can effect the way our brain works? Or they way we think?