Oranges are not that much of an excellent fruit

As with other fruits, oranges are generally considered to be healthy. Oranges contain no fat, are moderately low in calories and contain a number of beneficial nutrients. Oranges may not be ideal for all nutritional plans, and eating oranges may have disadvantages for you. Consult a doctor before altering your nutritional intake.

Lack of Fat

Oranges do not provide any dietary fat. Although this nutrient is high in calories -- each gram of fat provides 9 calories, compared to 4 in a gram of carbohydrates or protein -- it can be healthy. Your body needs dietary fat to absorb certain vitamins, and dietary fat also provides energy for endurance exercise and aids in blood clotting and brain development. Thus, the lack of fat can be detrimental, especially if you use oranges to replace foods such as nuts, which provide healthy fats.

Low in Fiber

If you're dieting, eating fiber can be beneficial, as it provides feelings of satiety. However, oranges are relatively low in fiber, with just 2 g in an 100 g orange. In addition to making you feel full, fiber helps manage your cholesterol and blood sugar levels, and helps promote regular bowel movements. Thus, eating oranges in place of foods higher in fiber can be detrimental for weight loss and general health.

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Source Livestrong.com