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Protective traits that once ensured our species’ survival — hunger, thirst, fear, and blood clotting — are now leading causes of illness and death in industrial societies.

For some types of autism, gastrointestinal problems may originate from the same genetic changes that lead to the behavioral and social characteristics of the condition.

Heavy cannabis use may alter the brain's dopamine system, revealing patterns of addiction commonly seen in other types of illicit drug use.