Energy & Metabolism
Banana
One of the most reached-for fruits before and after exercise, thanks to its fast carbohydrate and meaningful potassium content.
Energy
Heart Health
Recovery
Serving
1 medium (118g)
Calories Per Serving
105
Key nutrients
Potassium, vitamin B6, fast carbohydrate, resistant starch (unripe)
Nutrient density
30
Why it’s worth eating
Bananas provide potassium, vitamin B6, and fiber. They support heart health and energy. Eat as a snack, add to smoothies, or bake into breads and muffins.
What you may notice
Exercise energy and recovery
Digestive comfort
Markers worth tracking
Potassium levels
Fasting blood glucose
How to eat it
Eat slightly underripe (more green) if you want more resistant starch and a lower glycemic impact; fully ripe bananas are sweeter and digest faster.
Pairs well with
Nut butter, slows the sugar release and adds protein and fat for a more balanced snack
Eaten post-exercise, the fast carbohydrate and potassium support glycogen and electrolyte replenishment
Storage
Store at room temperature; refrigerating slows ripening but darkens the peel (the fruit inside is unaffected).
The numbers, per 1 medium (118g)
0%
Vitamin K
0%
Vitamin A
11%
Vitamin C
0%
Calcium
2%
Iron
8%
Magnesium
9%
Potassium
0%
Vitamin B12
0%
Vitamin D
Fiber
3.1g
Bananas, raw (FDC 173944)
Evidence
B
Banana as an exercise fuel is well supported and matched a sports drink head to head. The potassium and blood-pressure benefit is inferred from cohort and mechanistic data rather than banana-specific RCTs.
Study dose vs. serving
Bananas (0.2 g/kg carbohydrate every 15 min) matched a 6% carbohydrate sports drink for performance, blood glucose, inflammation and oxidative stress. One medium banana is about 27 g carbohydrate. Realistic serving.
Nieman DC, et al. PLoS One. 2012;7(5):e37479. DOI 10.1371/journal.pone.0037479. 14 trained cyclists, randomized crossover, 75-km time trials.
Use caution if
You're on a potassium-restricted diet (e.g., certain kidney conditions), bananas are notably potassium-dense; check with a doctor
You have a latex allergy, banana is a recognized cross-reactive fruit
Details
Type
Fruits & Veg
Season
Imported, year-round
Forms
Fresh, dried, frozen, flour (green banana)
Price
Budget
Bioactive
Potassium plus resistant starch (highest in unripe fruit)
Heat stable
Partial - RIPENESS MATTERS: unripe green bananas are high in resistant starch, which converts to sugars as the fruit ripens, materially changing the glycemic response
Watch
HIGH POTASSIUM is a genuine caution for chronic kidney disease patients on potassium restriction. Latex-fruit syndrome cross-reactivity is documented.
Reliability
4 / 5
More for Energy & Metabolism
