Bananas are generally a nutritious food, but claims that they can either cause or cure stomach problems depending on how ripe they are are not supported by strong medical evidence.
The original claim that eating an overly ripe banana causes stomach upset because it retains large amounts of acid is not supported by the medical sources reviewed. The U.S. Department of Agriculture lists both ripe and overripe bananas as food products, but the evidence does not establish that overripe bananas cause excessive stomach acid or stomach inflammation.
Bananas do contain a range of naturally occurring compounds. Research has identified alkaloids and other bioactive substances in bananas and banana products, including compounds with antioxidant activity. But the presence of these compounds does not mean that eating bananas treats stomach disorders or removes toxins from the body.
The claim that banana peel forms on the walls of the stomach is also incorrect. Food is broken down in the digestive tract, and there is no established medical mechanism in which banana skin coats the stomach to stimulate saliva or remove toxins.
What about acid reflux?
Bananas are sometimes promoted as a food that can neutralize stomach acid, but the evidence is more limited than such claims suggest.
Gastroesophageal reflux occurs when stomach contents flow back into the esophagus. Persistent reflux can develop into gastroesophageal reflux disease, or GERD. Common symptoms include heartburn and regurgitation.
Diet affects people with GERD differently. The National Institute of Diabetes and Digestive and Kidney Diseases says some people experience worse symptoms after particular foods and recommends identifying individual dietary triggers. Commonly reported triggers include acidic foods, alcohol, chocolate, caffeine, high-fat foods, mint and spicy foods. Bananas are not listed among the foods commonly linked to GERD symptoms on that guidance.
That does not mean bananas are a treatment for acid reflux. Medical treatment depends on the cause and severity of symptoms. Lifestyle changes and medicines such as antacids, H2 blockers and proton pump inhibitors may be used to manage GERD.
Bananas and potassium
Bananas are a source of potassium, an essential mineral, but the supplied article goes too far in claiming that their potassium is “extremely effective” at lowering stomach acid.
There is no basis in the reviewed medical guidance for recommending bananas as a way to neutralize stomach acid because of their potassium content. People with recurring reflux or indigestion should instead identify foods that trigger their symptoms and seek medical advice when symptoms persist.
NSAIDs are a separate issue
The original article also incorrectly links bananas with the risks of nonsteroidal anti-inflammatory drugs, or NSAIDs.
Medicines such as aspirin and ibuprofen are NSAIDs. These medicines can cause gastrointestinal irritation and, in some circumstances, ulcers and bleeding. The U.S. Food and Drug Administration warns that aspirin-containing products can increase the risk of bleeding in the stomach and gastrointestinal tract.
But ulcers are not called “pneumonitis.” Pneumonitis refers to inflammation of lung tissue and is unrelated to the stomach ulcers described in the source.
NSAIDs can also worsen symptoms of gastroesophageal reflux in some people, according to NIDDK.
For people experiencing persistent indigestion, heartburn or stomach pain, the appropriate treatment depends on the underlying cause. NIDDK notes that indigestion can have several causes and may require dietary changes, medicines or treatment for an underlying condition.
Persistent symptoms should not simply be treated by repeatedly changing banana intake or taking over-the-counter medicines. Medical attention is particularly important when symptoms are accompanied by persistent vomiting, difficulty swallowing, unexplained weight loss, chest pain or signs of gastrointestinal bleeding.
