Is Banana Low FODMAP?

Bananas are one of the most popular fruits on earth — and for people with IBS, one of the most confusing. The answer isn't simply yes or no: it depends almost entirely on how ripe the banana is.

FODMAP status at a glance

Monash University — who maintain the gold-standard FODMAP database — rate bananas as follows:

• —Unripe (firm, some green on skin): low FODMAP at 1 medium (100 g)
• —Ripe (fully yellow, soft): low FODMAP at a small portion (81 g) only
• —Overripe (brown spots, very soft): high FODMAP — excess fructose

As a banana ripens, starches break down into free sugars. The proportion of fructose relative to glucose rises — and when fructose exceeds glucose, the excess passes into the colon and ferments, triggering IBS symptoms in sensitive people.

Portion size in practice

Bananas vary widely in size. A large banana can weigh 150 g — well over the safe threshold for ripe fruit. Weigh until you have a sense of what 100 g looks like.

Safe ways to eat bananas on a low-FODMAP diet

• —Eat unripe or just-ripe bananas as a snack — portable and filling
• —Slice into oatmeal or rice-based cereal
• —Blend into smoothies when still firm (frozen unripe banana works well)
• —Avoid banana bread — traditional recipes deliberately use overripe bananas