With all the talk about self-improvement these days, people don't pay enough attention to self-worsening. In fact, there are many common behaviors that have been shown in one or more studies to make people stupider.
A UCLA study showed that steady sugar consumption for as little as six weeks "slows the brain, hampering memory and learning." Americans consume 35 pounds of high-fructose corn syrup each year, UCLA reported via the U.S. Department of Agriculture.
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