There's almost no chance of you getting a Vitamin C overdose eating oranges, as the upper limit for overdosing is 2000 mg - and even then, symptoms might not appear unless that number is doubled. read more
Some experts encourage people to eat up to two oranges per day for the fruit's beneficial phytochemicals, flavenoids and vitamin C content. There is some debate, however, over whether or not the benefits of orange consumption outweigh the potential drawbacks. read more
If you accustom your body to eating a lot of citrus fruit, you can easily eat 8 or 10 or 20 oranges with no particular effect, besides the calories. Oranges don’t have a lot of protein, so you can’t live on them alone. read more