Why do some cultures shun pork?

Pigs are not eaten in various parts of the world, often for religious reasons. What might have caused this aversion? Travelling all around the world to learn about pig production worldwide, there is a relatively large zone where my planes never touch the ground. This roughly extends from Istanbul to Kolkata and from the Sahara until the Caucasus – Northern Africa, the Middle East and what is defined as South Asia. Preference for other types of meat In India, often vegetarian meals are preferr