I was watching a documentary about how the British army were getting sick in the far east, fighting the Japanese. The troops were eating canned "bully beef" which turned to hot diarrhea in. . those conditions. A Japanese officer said the Japanese didn't suffer in the same way. He said, in the jungle just watch what the animals are eating. monkeys, for instance.Also, you can kill a snake and cook it with curry powder. plenty of fresh fruit and vegetables.
In the same documentary, at first, the British couldn't figure out the Japanese secret weapon for getting around so fast. bicycles.