Which food, first domesticated in southeast asia, provided a nutritious supplement to bantu diets and allowed the bantu to expand into forested regions?

Bananas

Explanation:

Bananas were originally brought by conquerors in approximately 327 BC. Bananas are in fact part of the berry family and are a rich source of potassium ions for the body (K⁺). The potassium ion balance in the body is required to be monitored carefully because this controls the amount of water in the body.