这个吓人
版主: huangchong
Re: 这个吓人
人类得整个算,都是同一物种,你不能一个一个的算。
我以前看一片子,印象是南美热带雨林里有一个地方的岩石老有动物来舔,就是为了必需的盐分和矿物质。你说的那个部落可能也有这样的宝地,最不济还可以吃虫子吧。
我以前看一片子,印象是南美热带雨林里有一个地方的岩石老有动物来舔,就是为了必需的盐分和矿物质。你说的那个部落可能也有这样的宝地,最不济还可以吃虫子吧。
huangchong 写了: 2022年 8月 7日 15:48 一些印度人就吃纯素。可能一辈子吃荤的机会只有吃奶那两年。
好像以前说南美雨林里一个混得特别失败的部族也是,完全抓不到任何动物,于是也吃纯素。还被科学家研究了一下,吃纯素某些维生素和氨基酸哪里来的。
Re: 这个吓人
reknaz 写了: 2022年 8月 7日 16:00 人类得整个算,都是同一物种,你不能一个一个的算。
我以前看一片子,印象是南美热带雨林里有一个地方的岩石老有动物来舔,就是为了必需的盐分和矿物质。你说的那个部落可能也有这样的宝地,最不济还可以吃虫子吧。
可以算个亚种。
其实东亚人,白人,黑人,确实就是人的亚种。尤其是古代。
那个部落,估计可以吃点虫子。理论上讲,如果绝对不吃动物,缺氨基酸和脂肪还可以凑合,缺维生素B12是不行的。 B12是细菌做的,但是人类只能从动物获得(动物是从草食动物肚子里的细菌来的)。
人自己肚子里的细菌住在大肠里,它们虽然也能做B12,但是除非此人的大肠能回流到小肠,那些细菌造的营养没法被人吸收。
Re: 这个吓人
有趣的是,不反刍的食草动物因为草料发酵地方不对,本来也是吃不到细菌的营养的。但是有些动物会拉特殊的软屎,然后把这个软屎再吃一次。于是就把这个B12给吃到了。兔子就有这个行为。
Vitamin B12 is produced in nature by certain bacteria, and archaea.[59][60][61] It is synthesized by some bacteria in the gut microbiota in humans and other animals, but it has long been thought that humans cannot absorb this as it is made in the colon, downstream from the small intestine, where the absorption of most nutrients occurs.[62] Ruminants, such as cows and sheep, are foregut fermenters, meaning that plant food undergoes microbial fermentation in the rumen before entering the true stomach (abomasum), and thus they are absorbing vitamin B12 produced by bacteria.[62][63] Other mammalian species (examples: rabbits, pikas, beaver, guinea pigs) consume high-fibre plants which pass through the intestinal system and undergo bacterial fermentation in the cecum and large intestine. The first-passage of feces produced by this hindgut fermentation, called "cecotropes", are re-ingested, a practice referred to as cecotrophy or coprophagy. Re-ingestion allows for absorption of nutrients made available by bacterial digestion, and also of vitamins and other nutrients synthesized by the gut bacteria, including vitamin B12.[63] Non-ruminant, non-hindgut herbivores may have an enlarged forestomach and/or small intestine to provide a place for bacterial fermentation and B-vitamin production, including B12.[63] For gut bacteria to produce vitamin B12 the animal must consume sufficient amounts of cobalt.[64] Soil that is deficient in cobalt may result in B12 deficiency, and B12 injections or cobalt supplementation may be required for livestock.[65]