2010年初，欧洲团队发表了微生物基因普查报告：在人体的消化系统(digestive system)内，有1000多个菌种的330万个基因，大约是人类基因组2万~2万5000个基因的150倍。
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大多数的营养食品成分不是被吸收，而只是简单地流过了人体的消化系统。
However, most of these nutraceuticals are not absorbed but are simply flushed through the body's digestive system.
纤维素和它的改性形式可作为膳食纤维被利用，因为当它们通过人体的消化系统时，对营养和供热方面的贡献不大。
Cellulose and its modified forms serve as dietary fiber because they do not contribute significant nourishment or calories as they pass through the human digestive system.
但是，我们有理由认为，和其他类人猿相比，食物加工，包括烹饪在内，对人体消化系统的变化起了重要作用。
However, it is plausible that food processing, including cooking, played a major part in the changes in the human digestive system compared with the other great apes.
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