Pears are low-calorie and high-nutrition fruit. A medium-sized pear only has 100 calories and is rich in vitamin C. In addition, the reason why pears are good for losing weight mainly results from its rich fiber. On average, a pear contains 5 grams of fiber, which is equivalent to one quarter of human body's daily requirement. Fiber can help the intestines reduce absorption of fat, thereby playing a role in losing weight.