why do different people have different reactions when they eat spicy food?

Question: why do different people have different reactions when they eat spicy food?
- Keywords:
  food,
  nutrition,
  sense
Asked by blinkoneightwo to Ben, Clare, Ezzy, Mario, Sam on 13 Mar 2012.
- Elizabeth Pearson answered on 13 Mar 2012:
  
  Some of it’s just personal preference. Some people can’t taste is as much, or have digestive systems better at dealing with it. The more you eat the spicier you can stand. So people who eat a lot of spicy food tend to like spicier food.

Question: why do different people have different reactions when they eat spicy food?