Bananas are an Item in Sea of Thieves
Lightly colored and brimming with potassium, these tropical fruits are, currently, the only "real" method by which a pirate can restore their health to full, otherwise, they must risk escaping the Ferry of the Damned.
An individual Banana restores 25% of total health, for example, a pirate on the brink of death would need to eat four Bananas to regain full health.
A single pirate can carry a maximum of 5 Bananas at a time, while a Ship can store a maximum of 100.
The Merchant Alliance, while not currently asking for Bananas as deliverables, do require that captured Pigs be fed while on the journey to an Outpost, with Bananas the only viable option.