Heidi's Klum's catchphrase - "One day you're in, and the next day you're out" - applies as much to food as it does to fashion. Over the years, we've all had favourite eats hit the healthy-food blacklist, but thankfully, some of them are making a return. In fact, recent research has not only redeemed once-taboo foods such as steak, eggs (yolks included), and peanut butter, but also found that when eaten in moderation, some of them may actually help you conquer the scale.

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