The simplest answer is that it is forbidden by Allah in the Qur'an. There are many reasons that we may speculate as to why the prohibition may have come about. However the real reason is because He told us not to, just as He commanded previous generations before us.
Why do Muslims not eat pork?
The Muslim Perspective
Aren't Allah, Brahman and Yahweh just different names for the same God?
Answers: Atheist, Muslim, Christian
How is the trinity monotheistic?
Answers: Muslim, Atheist, Christian
I highly doubt that Africans are descendants of Adam and Eve so, where do we come from?
Answers: Christian, Atheist
What makes your reasoning any more reliable than an animal's?
Do you believe that a human can voluntarily turn to god of her own will?
Muslim On Developing Theology of Peace in Islam Asghar Ali Engineer Muslim A Living Faith: My Quest for Peace, Harmony and Social Change Asghar Ali Engineer Muslim Islam: Religion, History, and Civilization Seyyed Hossein Nasr Muslim Islam in Contemporary World Asghar Ali Engineer Muslim Islam Fazlur Rahman Muslim Islam: Misgivings and History Asghar Ali Engineer Muslim The Prophet of Non-Violence: Spirit of Peace, Compassion & Universality in Islam Asghar Ali Engineer Muslim Islam vs. Islamism: The Dilemma of the Muslim World Asghar Ali Engineer