I lived with Karen people in Easter Burma for several years. One year the combination of poor timing for the rains[1] and fighting with the Burmese[2] left food scarce for many, including the village I lived in. We ate thin rice soup with bamboo shoots (bamboo is all fiber and water, very little if any nutrients) and greens for the first few months, and then fresh or fermented bamboo soup.

Normally the village elders have strict rules on where and how much fishing they allow to keep it sustainable, but that year people were so desperate they fished the river clean. You couldn't catch even the smallest fish, and it took several years to recover.

[1] There was too much rain and the slash-and-burn farms never had a chance to dry out. Slash-and-burn farms are very dependent on an old forest (usually 10 to 20 years or more) and a dry period in which to burn it off and expose the rich soil underneath.

[2] The Karen would try to hide their rice silos in the forest so the Burmese troops would be able to find it. If the soldiers did find them they'd take what they wanted and burn the rest.