Bats are mostly insectivorous or phytophagous. It is hypothesized that bats are evolved from small insectivorous mammals. Therefore, the digestive and metabolic systems of phytophagous and insectivorous bats must have evolved differently to adapt to their dietary habits. To investigate the difference in sugar tolerance in bats, we determined changes in blood glucose levels after intraperitoneal (i.p.) injection of glucose in three species of phytophagous and four species of insectivorous bats under resting conditions. Results showed that phytophagous bats eliminated blood glucose faster than insectivorous bats. All three species of fruit bats reduced blood glucose to fasting levels within 30–45 min, whereas all insectivorous bats failed to lower blood glucose to fasting levels even 120 min after i.p. glucose injection. Taken together, results of this study suggest that bats have undergone adaptations and become diversified in dietary habits.

中文翻译：

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食草蝙蝠和食虫蝙蝠的葡萄糖耐量差异

蝙蝠大多是食虫性或植食性的。据推测，蝙蝠是从小型食虫哺乳动物进化而来的。因此，食草蝙蝠和食虫蝙蝠的消化和代谢系统一定发生了不同的进化，以适应它们的饮食习惯。为了研究蝙蝠糖耐量的差异，我们确定了在休息条件下腹腔 (ip) 注射葡萄糖的三种食草蝙蝠和四种食虫蝙蝠的血糖水平变化。结果表明，食草蝙蝠比食虫蝙蝠更快地消除血糖。所有三种果蝠都在 30-45 分钟内将血糖降至空腹水平，而所有食虫蝙蝠即使在腹腔注射葡萄糖后 120 分钟也未能将血糖降至空腹水平。综合起来，