Are Bananas Good for Fatty Liver? Sugar, Ripeness and Potassium
Yes, in normal portions. A medium banana has about 14 g of natural sugar and a low glycemic index of 51, and less-ripe bananas raise blood sugar less.
TL;DR
- Bananas fit a fatty liver diet. A medium banana has about 105 calories, 14 g of natural sugar and 3 g of fiber, and a low glycemic index of 51.
- Ripeness changes the carbohydrate: in under-ripe bananas most of it is starch, which turns into sugar as the banana ripens. Slightly green bananas raise blood sugar less.
- Bananas are rich in potassium. That’s fine for most people, but if you have kidney disease or take water pills for cirrhosis, ask your doctor how much potassium is right for you.
Yes, bananas are good for fatty liver for most people. They’re a whole fruit with fiber, potassium and less fructose than many other fruits, and people with MASLD (formerly NAFLD) don’t need to avoid them.
The details worth knowing are portion size, ripeness and, for a smaller group of people, potassium. Here’s how bananas compare and how to fit them in.
How Much Sugar Is in a Banana?
A medium banana (7 to 8 inches long, 118 g) has, according to USDA data:
- 105 calories and 27 g of carbohydrate
- 14.4 g of natural sugar (no added sugar)
- 3.1 g of fiber
- 422 mg of potassium
Bananas have a little more starch and calories per serving than most fruits, but their sugar is less fructose-heavy. A medium banana has about 5.7 g of fructose, roughly half the 10.7 g in a medium apple. Fructose is the sugar liver guidelines worry about most, mainly in the large amounts that come from sugary drinks and added sugar. Our guide to whether fruit is bad for fatty liver explains why whole fruit is a different story.
Does Ripeness Change the Sugar in a Banana?
Yes. As a banana ripens, its starch turns into sugar. In under-ripe bananas, starch makes up 80 to 90% of the carbohydrate, according to a 1992 study in Diabetic Medicine. As the banana ripens, that starch changes into free sugars, which is why a spotty banana tastes so much sweeter.
That same small study shows the effect on blood sugar. Ten people with type 2 diabetes ate 120 g of under-ripe or over-ripe banana on separate days. The under-ripe banana raised blood sugar about 40% less than the over-ripe one. The researchers suggested this was due to its starch, which the body digests slowly.
USDA doesn’t list separate sugar values by ripeness, so there’s no exact gram count for a green versus a spotty banana. The practical takeaway: if blood sugar is a concern, choose bananas that are yellow or still a little green at the stem, and save the very ripe ones for baking.
What Is the Glycemic Index of Bananas?
The glycemic index (GI) ranks foods by how much they raise blood sugar compared with pure glucose. In the international GI tables published in Diabetes Care in 2008, raw banana averages a GI of 51, in the low range (55 or less). For comparison:
- Apple: 36
- Orange: 43
- Banana: 51
- Mango: 51
- Pineapple: 59
- Watermelon: 76
The NIDDK suggests that people with fatty liver eat more low-GI foods, “such as most fruits, vegetables, and whole grains.” Bananas qualify. GI doesn’t account for portion size, though, so two bananas will still raise blood sugar more than one.
How Do Bananas Compare With Other Fruits?
Here’s how a medium banana stacks up against other common fruits per typical serving, sorted from least to most sugar:
| Fruit (serving) | Calories | Sugar | Fiber | Potassium |
|---|---|---|---|---|
| Kiwifruit, 1 fruit (69 g) | 42 | 6.2 g | 2.1 g | 215 mg |
| Strawberries, 1 cup halves (152 g) | 49 | 7.4 g | 3.0 g | 233 mg |
| Banana, 1 medium (118 g) | 105 | 14.4 g | 3.1 g | 422 mg |
| Blueberries, 1 cup (148 g) | 84 | 14.7 g | 3.6 g | 114 mg |
| Pear, 1 medium (178 g) | 101 | 17.4 g | 5.5 g | 206 mg |
| Apple, 1 medium (182 g) | 95 | 18.9 g | 4.4 g | 195 mg |
| Sweet cherries, 1 cup pitted (154 g) | 97 | 19.7 g | 3.2 g | 342 mg |
| Mango, 1 cup pieces (165 g) | 99 | 22.5 g | 2.6 g | 277 mg |
| Grapes, 1 cup (151 g) | 104 | 23.4 g | 1.4 g | 288 mg |
Source: USDA FoodData Central (SR Legacy).
Bananas sit in the middle for sugar, slightly higher for calories, and at the top for potassium. Berries and kiwi give you the most fiber for the least sugar, so mixing fruits through the week is a good habit.
Are Bananas High in Potassium?
A medium banana has 422 mg of potassium, about 9% of the 4,700 mg Daily Value. That’s a useful amount, but bananas aren’t the top source. In USDA data, a medium baked potato with its skin has about 950 mg, and a cup of orange juice has about 500 mg.
For most people with fatty liver, potassium from fruits and vegetables is part of a healthy diet. For a few groups, the amount needs a doctor’s input.
Who Should Be Careful With Bananas?
- People with kidney disease. When kidneys don’t work well, potassium can build up in the blood. The NIDDK notes that too little or too much potassium can cause heart and muscle problems, and that if your potassium level is high, your health care professional may recommend limiting high-potassium foods. Ask before cutting or adding bananas.
- People with cirrhosis who take water pills. Spironolactone, a diuretic often used for fluid buildup (ascites), reduces the body’s loss of potassium, so levels can climb. MedlinePlus advises talking with your doctor about how many potassium-rich foods, including bananas, to eat, and avoiding potassium-based salt substitutes. With other diuretics, such as furosemide, MedlinePlus notes that some people are told to eat more potassium-rich foods instead. Your blood tests decide which applies to you, so follow your hepatologist’s advice and see our cirrhosis diet guide.
- People with diabetes. Bananas are fine, but count them as carbohydrate.
How to Eat Bananas With Fatty Liver
Banana sizes vary more than most people realize:
| Banana size | Weight | Calories | Sugar |
|---|---|---|---|
| Small (6 to 7 in) | 101 g | 90 | 12.4 g |
| Medium (7 to 8 in) | 118 g | 105 | 14.4 g |
| Large (8 to 9 in) | 136 g | 121 | 16.6 g |
| Extra large (9 in or more) | 152 g | 135 | 18.6 g |
Source: USDA FoodData Central (SR Legacy).
A few ways to make bananas work for you:
- One banana is one fruit serving. If you eat about two servings of fruit a day, let the other be something like berries, an apple or citrus.
- Pair it with protein. A banana with a tablespoon of peanut butter (see is peanut butter good for fatty liver) or sliced into plain Greek yogurt makes a more filling snack.
- Go half and half. Half a large banana is plenty to sweeten oatmeal or a smoothie.
- Freeze very ripe bananas in chunks and use a few at a time instead of throwing whole ones into a smoothie.
- Treat banana desserts as desserts. Banana bread, banana pudding and banana splits get most of their sugar and fat from what’s added, not from the banana.
For other fruits with a similar profile, see is mango good for fatty liver.
The Bottom Line
Bananas are a good fit for fatty liver in normal portions. A medium banana has about 14 g of natural sugar, 3 g of fiber and a low glycemic index, and less fructose than many fruits. Slightly less-ripe bananas raise blood sugar less than very ripe ones.
Keep to about one banana at a time, pair it with protein, and mix in other fruits. If you have kidney disease, or cirrhosis treated with water pills, ask your doctor how much potassium you should be eating before you add or cut bananas.
Sources
- Atkinson FS, Foster-Powell K, Brand-Miller JC. International tables of glycemic index and glycemic load values: 2008 (Diabetes Care, 2008)
- Hermansen K, et al. Influence of ripeness of banana on the blood glucose and insulin response in type 2 diabetic subjects (Diabetic Medicine, 1992)
- NIDDK: Eating, Diet, & Nutrition for NAFLD & NASH
- NIDDK: Healthy Eating for Adults with Chronic Kidney Disease
- MedlinePlus: Spironolactone
This article is for informational purposes only and is not medical advice. Talk to your doctor or hepatologist about your specific situation.
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Frequently Asked Questions
Can I eat a banana every day with fatty liver?
Yes, for most people. A medium banana has about 105 calories and counts as one of the roughly two servings of fruit most adults aim for each day. Rotating in berries, citrus and apples gives you more fiber for the sugar. The main exceptions are people who have been told to limit potassium, such as some people with kidney disease or those taking certain water pills for cirrhosis.
Are banana chips healthy for fatty liver?
Not really. Banana chips are a different food from fresh bananas because they are cooked in oil. In USDA data, one ounce of banana chips has about 147 calories and 8.2 g of saturated fat, roughly 40% of the 20 g Daily Value, while a whole fresh banana has almost no fat. Liver guidelines recommend limiting saturated fat, so treat banana chips as an occasional snack.
Is a banana smoothie OK for fatty liver?
It can be, if you build it carefully. Use half to one banana, blend it with plain Greek yogurt or milk for protein, and add berries or spinach. Avoid using fruit juice or sweetened yogurt as the base, since a cup of orange or apple juice alone adds about 21 to 24 g of sugar. Blending keeps the fiber, but it's easy to drink several servings of fruit in one glass.
Are bananas OK if I have diabetes and fatty liver?
Yes, counted as carbohydrate. A medium banana has about 27 g of carbohydrate, including 3 g of fiber, and its glycemic index of about 51 is in the low range. Less-ripe bananas raise blood sugar less than very ripe ones. A small banana, with about 23 g of carbohydrate, or half a large one eaten with protein such as peanut butter or yogurt is a sensible portion. Follow your care team's carb targets.