Sometimes what's going on is that the microbes are helping them digest food more efficiently from the same diet, so they're taking more energy from their food, but other times, the microbes are actually affecting their behavior.
微生物は食餌の消化を助け そこから効率よくエネルギーを 取っているという事もありますが 実際 宿主の行動に影響を与えているのです