The following sections explain some of the possible health benefits of bananas.
The nutrition information comes from the United States Department of Agriculture’s (USDA) FoodData Central databaseTrusted Source.
Daily requirements are from the 2015–2020 Dietary Guidelines for AmericansTrusted Source. These are for adults, but they are approximate, as the values vary according to a person’s age and sex.
Blood pressure
The American Heart AssociationTrusted Source (AHA) encourage people to lower their intake of salt, or sodium, and increase their consumption of foods that contain potassium. Potassium can help manage blood pressure and reduce strain on the cardiovascular system.
A medium banana provides almost 9% of a person’s daily potassium needs, according to the nutritional information from the above sources.
Asthma
A 2007 study suggested that eating bananas might help prevent wheezing in children with asthma. One reason for this could be the antioxidant and potassium content of bananas. However, more research is needed to confirm these findings.
Cancer
Laboratory investigationsTrusted Source have suggested that lectin, a protein that occurs in bananas, may help prevent leukemia cells from growing.
Lectin acts as an antioxidant. Antioxidants help the body remove molecules known as free radicals. If too many free radicals build up, cell damage can occur, potentially leading to cancer.
In 2004, researchers noted that children who consumed bananas, orange juice, or both appeared to have a lower risk of developing leukemia.
The study authors suggested that this could be due to the vitamin C content, as this, too, has antioxidant properties.
Heart health
Bananas contain fiber, potassium, folate, and antioxidants, such as vitamin C. All of these support heart health.
A 2017 reviewTrusted Source found that people who follow a high fiber diet have a lower risk of cardiovascular disease than those on a low fiber diet. Those who consumed more fiber also had lower levels of low-density lipoprotein (LDL), or “bad” cholesterol.
Diabetes
The American Diabetes Association recommend eating bananas and other fruit as they contain fiber. They note that eating fiber can help lower blood sugar levels.
The author of a 2018 review Trusted Source concluded that eating a high fiber diet could reduce the risk of type 2 diabetes and may lower blood sugar in those who already have the disease.
Digestive health
Bananas contain water and fiber, both of which promote regularity and encourage digestive health. One medium banana provides approximately 10% of a person’s fiber needs for a day.
Bananas are also part of an approach known as the BRAT diet trusted Source, which some doctors recommend for treating diarrhea. BRAT stands for bananas, rice, applesauce, and toast.
Diarrhea can lead to a loss of water and electrolytes, such as potassium. Bananas can replace these nutrients.
High fiber foods can trigger bloating, gas, and stomach cramps in people with inflammatory bowel disease (IBD), according to a 2012 study Trusted Source. However, bananas may improve symptoms, the authors concluded.
The Crohn’s and Colitis Foundation of America recommend banana as a snack food in their diet plan.
Preserving memory and boosting mood
Bananas contain trusted Source tryptophan, an amino acid that may help preserve memory, boost a person’s ability to learn and remember things, and regulate mood.