These are quickly becoming one of the hottest foods for improving health, and longevity. Therefor Not many foods are able to improve your sexual performance. to protect against cancer, and boost your metabolism. In other words as Brazil nuts can! So what are the specific health benefits of Brazil nuts? Well, let’s start at the very top with the anti-cancer powerhouse selenium. Brazil nuts are the densest food source of bio available selenium. Selenium is an antioxidant that plays many important roles in our body.