Whether blackberries, blueberries, strawberries, or raspberries, these sweet, juicy fruits are powerhouses among healthy foods. Their high antioxidant levels neutralize free radicals, unstable compounds that can damage cells and lead to such diseases as cancer. Berries’ valuable antioxidants can also slow down brain aging and enhance your memory. Finally, they’re a boon to your heart. Adults who ate about a cup of berries a day lowered their blood pressure and raised their good HDL cholesterol.