Thanks to droughts， floods and wars， serious faminesandstarvationdeaths hit China every few decades. Even during the prosperous Han and Tang dynasties， many people faced food shortage， as evident from many ancient poems.
美国国立衰老研究所（NIA）科学家茱莉·马蒂森及其同事对多项研究结果综合分析认为，只需降低进食量，就能延年益寿。1935年，一项小白鼠实验发现，将进食量降低30%~50%后，其寿命更长，衰老性疾病发病时间更迟。
