What If... We could stay young forever? 3/3

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What if we could feel more alive and more alert by just eating smaller meals? Extreme calorie restriction may hold the secret to the a longer live. According to some scientists, living to 120 and beyond could be possible - but is it worth a life of hunger and food deprivation? (Image: Woman pinching 'spare tyre' on her waist. Credit: Science Photo Library)