When [oranges] are consumed in excess, the higher fiber level might interfere with digestion, producing stomach discomfort and even diarrhea. If you consume too many oranges, you may have heartburn or regurgitation if you have gastroesophageal reflux disease (GERD), commonly known as acid reflux disease. Eating too many oranges can also cause urine to be red due to the presence of pigment in the fruit called furocoumarin, which is believed to be responsible for the association between eating these fruits and developing kidney stones. Oranges are a good source of vitamin C and potassium. They also contain iron, calcium, and phosphorous. Oranges are used in cooking to add flavor and color to dishes such as marinades, soups, and stews. People sometimes say that oranges are bad for you because they contain fructose, but this is not true. Fructose does not increase your risk of diabetes or heart disease like glucose does. Rather, it is the effect of consuming large amounts of sugar on hormones related to hunger and appetite that causes problems for people who are obese or trying to lose weight. Hitting the juice bar after work every day could be causing your problem with oranges - try cutting back or switching to grapefruit instead.