If you slice a banana into your oatmeal every morning, you might wonder whether grabbing another one in the afternoon is too much. For most healthy adults, one medium banana a day is reasonable. A second can fit, depending on its size, what else you eat, and whether you’ve been advised to watch your potassium or carbohydrate intake. Think of one as an example of a portion that can fit into your day. FDA
Start with the banana’s size.
The FDA’s nutrition chart for raw fruit puts a medium banana, with an edible portion of about 4.5 ounces, at roughly 110 calories, 30 grams of carbohydrate, 3 grams of fiber, and 450 milligrams of potassium. The banana you peel at home may be smaller or larger, so those numbers are estimates. If you regularly buy both snack-size bananas and larger ones, counting them as identical can give you the wrong picture. FDA
Portion size can also help you decide what you actually want to eat. Half a banana may be plenty on top of yogurt with berries, while a whole banana might be easier to pack when you’re heading out the door. You can slice and freeze the other half for a smoothie.
Related: 9 Mouthwatering Ways to Use Up Those Overripe Bananas
Look at the rest of your day.
If you enjoy a banana with breakfast and reach for another after a long afternoon, consider what else has been on the menu. A banana at breakfast and an orange after lunch add variety. If bananas are the fruit you have on hand today, you can have another and buy something different next time you go grocery shopping.
It also helps to notice what you’re asking the banana to do. If it’s a quick bite before dinner, it may be enough on its own. If it’s standing in for breakfast on a hectic morning, you might prefer it with plain yogurt, peanut butter toast, or a bowl of oats. That gives you more ways to use the same bunch throughout the week.
Count the portion if you manage blood sugar.
For people who count carbohydrates to manage diabetes, the banana’s size matters more than the number of pieces. The CDC lists an extra-small banana, about 4 inches long, as one carbohydrate choice, or about 15 grams of carbohydrate. The medium banana in the FDA chart contains about twice that amount. If you put banana in a smoothie or slice it over cereal, count the other ingredients too. CDC
The right portion depends on your meal plan, medication, and blood sugar goals. You might choose a smaller banana or use part of a larger one with breakfast. The CDC’s diabetes meal planning guide explains how to account for the whole meal. CDC
Check your potassium needs if you have kidney disease.
Healthy kidneys generally remove excess potassium. Chronic kidney disease can change how well the body clears it, and some medicines, including ACE inhibitors and potassium-sparing diuretics, can increase the risk of high blood potassium. If you have kidney disease, take one of these medicines, or have been told your potassium is high, ask your clinician whether you need to limit potassium before making bananas a daily habit. Potassium
If you’ve already been given a potassium target, ask your care team how a banana fits alongside the other foods you eat that day. Your needs can change as kidney disease progresses, so the portion that worked before may need another look. NIDDK
So, is one banana or two the better choice?
If you’re a healthy adult who likes bananas, start with one medium banana on the days you want one. Whether you reach for a second depends on how large the first was, what else you’ve eaten, and what sounds good. On days when you’d rather have an apple or a bowl of berries, choose those instead. If you follow a carb or potassium plan, use the portion that fits it. Potassium
