Because oranges are acidic, they can also lead to some irritation in the stomach lining, according to Everyday Health. In high doses, the acid content in citrus fruits has been shown to cause significant digestive complications (including the aforementioned heartburn and vomiting) in individuals who suffer from gastroesophageal reflux disease (GERD). Furthermore, too much potassium has been shown to cause a potentially serious condition called hyperkalemia, which can lead to nausea, weakness, muscle fatigue, and arrhythmias, per the Mayo Clinic. In extreme cases, the condition may even be life-threatening.
So while there is nothing wrong with enjoying an orange or two, it is best to include a wide variety of fruits and vegetables in your diet. Per Healthline, many experts recommended eating a varied selection of different-colored fruits and vegetables every day, rather than just one or two of your favorite foods. “Eating the rainbow” is one of the best ways to improve your health and ensure your diet has just the right amount of all the vitamins and nutrients your body needs.