ANSWERS: 4
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Because learning is a process that takes time and often involves mistakes along the way before we get it right.
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Health knowledge has grown in leaps and bounds just in the last thirty years. We didn't have the technology years ago.
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It is not really necessarily "wrong". It is just "blown way out of proportion". For example, BBC did an article on how they say chocolate is good for you, because it contains antibodies that help boost the immune system of the consumer, but they exaggerated too much and said that it might even be better for you than vegetables. Whereas chocolate does contain antibodies, it is only found in dark chocolate due to its high cocoa content and only contains the amount of antibodies found in one or two grapes. Scientists DO research and study topics, but it is the media that reports them.
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Health experts are people. People are not perfect. A health expert can be wrong, just like a pilot can be wrong, a hairdresser can be wrong, or a waiter can be wrong. People just make mistakes sometimes.
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