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John Elliott’s article introduces us to evolutionary psychology and some insights that can be gleaned from examining how behaviour and thought have evolved with mankind.Evolutionary psychology focuses on genetic relatedness and its relationship to behaviour but generally does not examine individual genes. However, with rapid progress in the field of genetics, we are now able to examine the role of specific genes as they influence personality and psychological processes. Redford William’s discussion of current work investigating gene-environment interaction provides a good background for the manner in which specific genes interact with aspects of environment to influence personality, emotion, and health risk, with a specific focus on genes involved with serotonin. Scientists know that this neurotransmitter plays an important role in mood regulation and in such psychological problems as depression. Genes do not operate in isolation, but their effects vary in different environments.One aspect of our environment that plays an important role is what we eat. We’ve known for a long time that our diet plays an important role in such diseases as cancer and heart disease.

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