Tell your parents that you feel very guilty eating meat as it involves the mass slaughter of innocent animals.
Tell them that animals are made to suffer confinement in crowded stalls,excruciating pain,torture and the most painful death that you can't even imagine.
Show them the links which I have posted.
Meat eating also directly affects the environment and degrades our natural resources at such an alarming rate that it would only seem rational for the whole world to go vegan.
Tell them that animals are also fed hormones and antibiotics to make them fatter and keep them alive in conditions in which they would otherwise die.
Their flesh contains these hormones and antibiotics which then enter our body when we eat them and plays havoc with our health too.
why to go vegan(show these links to your parents)
http://www.peta.org/issues/animals-used-for-food/meat-and-environment.aspx
http://www.veganasfuck.com/frequently-asked-questions/
http://www.chooseveg.com/animal-cruelty.asp
http://www.peta.org/issues/animals-used-for-food/global-warming.aspx
http://youtu.be/sDea6L9gPD8
http://youtu.be/es6U00LMmC4
http://www.veganpeace.com/animal_cruelty/dairy.htm