Rejuvenation has become a focal point in modern science, and the evidence shows nutrition is a weapon against ageing. One doctor has touted four dietary rules as the gold standard in rejuvenation nutrition. Doctor Youn, who offers advice about the best skin care online, says fermented foods, chocolate, protein and a sugar-free diet are key for a young complexion. “Here are four food musts if you want to rejuvenate your skin, to look younger and healthier,” said the expert. “Eat more healthy protein,” he continued. “Our skin is composed of 70 to 80 per cent of collagen. “We lose about one per c…