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We all have them - habits we think are healthy because we heard them somewhere on the news or from a health-conscious friend. And no matter how much we hate them, we just keep doing them because we think they're good for us.
Take using BMI to tell whether you're a healthy weight. Is it really the best measure of fitness? Or taking a daily multivitamin. Healthy habit or a little bit of nonsense?
The answers to these questions might surprise you.