Olga's legacy: The brain of a famous athlete in her 90s still revealing clues about longevity
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Olga Kotelko didn't take up track and field until she was 77 years old.
Here's how yo-yo dieting affects your body (and your mind)
May 10, 2017, 9:12 a.m. by Jenn Savedge
When your weight cycles up and down, it's not just bad for your waistline, it's bad for your overall health.
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