Vitamin B12 has myriad benefits from supporting healthy blood cells and nerve function to keeping the brain sharp and focused. Now, scientists have discovered yet another positive impact. B12 could help protect the human body from accelerated aging and disease, according to Cornell University researchers. The recent study , which looked at B12 deficiencies in mice, found that the vitamin can fight stress to our metabolism and immune system invaders. The findings have major implications for Americans with around 10 million people not getting enough of the vitamin . People can get more through a balanced diet that includes meat and fortified foods, such as cereals and breads. Ensuring you get enough B12 could help you make gains in the gym, too, the Cornell study showed. A woman shops for soy milk in Northern California.…