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Bell peppers, a superfood for weight loss, are low in calories and higher in fiber, Shira Hirshberg from All Foods Nutrition, says. They are mainly made up of water and carbs. Red bell peppers contain more than 10 times the beta-carotene found in green bell peppers and provide157 percent of the recommended daily value of vitamin C. Also, capsaicin, which gives peppers their spice, has been shown to boost metabolism.