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 Sutras.

Trantras quoted by Shabkar Tsodruk Rangdrol (1781-1851):

• Akshobya Tantra (no meat, alcohol, garlic)
• Amogha Pasha (no meat, alcohol, garlic, onion, leeks, tsok*)
  
• Commentary on the Kalachakra-tantra (no meat, no meat as tsok)
• Embodiment of Awareness (no meat and blood)
• Embodiment of Wisdom (no meat and blood)
• Kalachakra Tantra (not even wishing to eat meat)
• Kriya Tantra (no meat, alcohol, garlic, onion, leeks, tsok)
• Lotus Net Tantra (no food from butchersl, no water with insects)
• The Stainless Light - Commentary on the Kalachakra-tantra (no meat)

For obtaining the context of the quotes, please see the source at the last line.

* Tsok is food as offering