The vitamin C in oranges helps your body in lots of ways:
Protects your cells from damage
Helps your body make collagen, a protein that heals wounds
Makes it easier to absorb iron
Boosts your immune system, your body's defense against germs
Slows the advance of age-related macular degeneration (AMD), a leading cause of vision loss.
The 3 grams of fiber in a medium orange help keep your bowels healthy, your cholesterol low, and ulcers at bay. Fiber also slows the way your body absorbs sugar -- a big bonus if you have diabetes.