sentences:  Psychosocial stress early on in life, including behaviours such as physical violence and substance abuse, can predict EPC in later life.This has been explained as being due to Life History Theory, which argues that individuals who are reared in environments, where resources are scarce and life expectancy is low, are more likely to engage in reproductive behaviours earlier in life in order to ensure the proliferation of their genes.Individuals reared in these environments are said to have short life histories.