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

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)