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Roasted Coffee Beans Offer Health Benefits Roasted coffee beans are rich in antioxidants and caffeine. However, the amount of coffee beans you can eat without exceeding safe levels of caffeine varies by person. Consuming too many coffee beans can lead to negative effects such as heartburn, stomach upset and increased the frequency of bowel movements. The most healthy type of coffee is black coffee, which doesn't contain milk or sugar. Even a cup of black coffee can be packed with calories.