Is It Safe to Eat Blackened Parts of a Banana? - Nutrition

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Hello, nutritionist.
I just ate a banana and accidentally consumed a small part that was blackened.
Is that part safe to eat? Will it cause any issues? Thank you for your response.

Jiang, 20~29 year old female. Ask Date: 2019/03/05

Dr. Cai Xiuwen reply Nutrition


Hello, regarding bananas, the peel contains enzymes that, when exposed to air for too long, undergo oxidation and turn black, leading to the appearance of dark spots on the peel.
At this stage, the fruit flesh remains protected from air oxidation and is still edible.
However, if the flesh has turned black, it may indicate that it has been damaged and oxidized, potentially leading to nutrient degradation and bacterial growth, in which case it is not recommended for consumption.
The nutrients found in banana flesh include vitamin C, potassium, magnesium, dietary fiber, and fructose.
Regular consumption of bananas can help replenish electrolytes and vitamins, and it can effectively lower cholesterol levels and high blood pressure in the bloodstream.
Therefore, it is advisable to include them in your diet.
This information is provided by Dietitian Tsai Hsiu-Wen from Nantou Hospital, Ministry of Health and Welfare.
Wishing you peace and good health.

Reply Date: 2019/03/05

More Info


When it comes to eating bananas, the presence of blackened parts can raise concerns for many. The black spots on a banana are typically a result of enzymatic browning, which occurs when the fruit is exposed to air over time. This process is not harmful in itself, and the blackened areas are generally safe to consume, provided that the fruit is not overly ripe or spoiled.

The black spots indicate that the banana is ripening and may be sweeter than its less ripe counterparts. However, if the flesh of the banana has turned black or mushy, it may be a sign of overripeness or decay. In such cases, the nutritional quality of the banana may be compromised, and there is a potential risk of bacterial growth. If you accidentally consumed a small amount of the blackened part, it is unlikely to cause any harm, especially if you feel fine afterward.

Bananas are rich in essential nutrients, including vitamin C, potassium, magnesium, dietary fiber, and natural sugars like fructose. Regular consumption of bananas can help replenish electrolytes and provide energy, making them a great snack option. Additionally, bananas have been shown to help lower cholesterol levels and manage blood pressure, contributing to overall heart health.

In terms of safety, it is important to inspect the banana before consumption. If the banana has only minor black spots on the skin and the flesh appears firm and yellow, it is perfectly fine to eat. However, if the banana has extensive blackening, a foul odor, or a mushy texture, it is best to discard it to avoid any potential gastrointestinal issues.

In summary, eating a small amount of blackened parts of a banana is generally safe, as long as the fruit is not overly spoiled. If you have any concerns about food safety or experience any unusual symptoms after consuming questionable food, it is always advisable to consult a healthcare professional for personalized advice. Eating a balanced diet that includes a variety of fruits and vegetables is key to maintaining good health, and bananas can be a delicious and nutritious part of that diet.

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