By Ashley Neglia for YouBeauty.comWe won’t name names, but certain major organs -- ahem, the heart, liver and kidneys -- seem to have been hogging the research spotlight when it comes to how they’re affected by diet and overall health. But judging from several recent studies, our brain doesn't get a free ride."We've managed to treat those diseases, such as heart disease and cancer, that would otherwise kill us," says Dr.