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
Why are there so many different Christian religions and denominations? Which one is right?
Can non-Christian views be internally consistent?
Since there can be no evidence for something that can't be measured, is it at least fair to say that there is no empirical evidence for god, and therefore no reason to believe he exists?
Answers: Muslim, Christian
Is there anything that troubles you personally about the belief system you adhere to? What is it and why is it troubling?
Answers: Atheist, Christian
What unique evidence is there for your religion or worldview? Can you prove that what you say is true?
Answers: Hindu, Christian
Muslim Islam: Religion, History, and Civilization Seyyed Hossein Nasr Muslim The Rights of Women in Islam Asghar Ali Engineer Muslim Islam vs. Islamism: The Dilemma of the Muslim World Asghar Ali Engineer Muslim Islam Fazlur Rahman Muslim Islam in Contemporary World Asghar Ali Engineer Muslim A Living Faith: My Quest for Peace, Harmony and Social Change Asghar Ali Engineer Muslim Welcome to Islam: A Step-by-Step Guide for New Muslims Mustafa Umar Muslim On Developing Theology of Peace in Islam Asghar Ali Engineer