Many Buddhist practitioners refrain from eating meat, fish, egg, milk, union, garlic or other foods and drinks; not because 'it is written' as such, but because it is beneficial to living a Buddhist way of life. See also Tantras.

Sutras on refraining from eating meat quoted by Shabkar:

• Angulimala Sutra
• Lankavatara Sutra (see below as well)
• Mahaparinirvana Sutra (also no fish - see below as well)
• Saddharmasmrityupasthana Sutra
• Sutra Describing Karmic Cause and Effect (also no fish)
• Vinaya-Sutra

• Brahmajala Sutra
• Jivaka Sutra
• Kandaraka Sutra (don't be a butcher, fowler, traper of wild, or fisherman)
• Lankavatara Sutra Chapter 8 as transl. by W. Bagley [download PDF - 300 KB]
• Lankavatara Sutra Chapter 8 as transl. by D.T. Suzuki [download PDF - 119 KB]
• Maharinirvana Sutra (also no fish) [download PDF - 5 MB]
• Maharinirvana Sutra - Lobsa slideshow (also no fish)
  
• Sanghata Sutra
• Surangama Sutra