Can you really ask what reason Pythagoras had for abstaining from flesh?  For my part I rather wonder both by what accident and in what state of soul or mind the first man did so, touched his mouth to gore and brought his lips to the flesh of a dead creature, he who set forth tables of dead, stale bodies and ventured to call food and nourishment the parts that had a little before bellowed and cried, moved and lived.  How could his eyes endure the slaughter when throats were slit and hides flayed and limbs torn from limb?  How could his nose endure the stench?  How was it that the pollution did not turn away his taste, which made contact with the sores of others and sucked juices and serums from mortal wounds?  ~Plutarch