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Why is eating chocolate so pleasurable? Can the function of just one small group of chemicals really determine whether you are happy or sad? Does marijuana help to improve your memory in old age? Is it really best to drink coffee if you want to wake up and be alert? Why is a drug like PCP potentially lethal? Why does drinking alcohol make you drowsy? Do cigarettes help relieve anxiety? Can eating less food preserve your brain? What are the possible side effects of pills that claim to make you smarter? Why is it so hard to stop smoking? Why did witches once believe that they could fly? In this book, Gary Wenk demonstrates how, as a result of their effects on certain neurotransmitters concerned with behavior, everything we put into our bodies has direct consequences for how we think, feel, and act. The chapters introduce each of the main neurotransmitters involved with behavior, discuss its role in the brain, and explain ways to influence it through what we consume.