益生元是什么？简单说，它就是肠道有益菌（如乳酸杆菌、双歧杆菌）的“专属口粮”，能促进它们生长繁殖从而抑制有害菌并改善肠道环境。传统的益生元包括低聚果糖（FOS）等。而昆虫外骨骼中富含的几丁质及其衍生物壳聚糖，正展现出类似的潜力。

BEIJING, Dec. 22 (Xinhua) -- A new cold front is poised to sweep across China, bringing strong winds and significant temperature drops over the next three days, along with snowfall in northern regions ...