3 ms·

I thought there were a few required proteins that were very hard to supply in the body without an animal source

• tree_of_item 8y ago
  I thought the same. I get the sense people gloss over this in their promotion of vegetarianism/veganism
• spraak 8y ago
  All amino acids originate from non-animals (plants, microbes). Where do you think other animals get their essential amino acids? They eat plants or eat an animal that ate plants. All plant proteins have all of the essential amino acids. The only truly “incomplete” protein is gelatin, which is missing the amino acid tryptophan, so the only protein source you couldn’t live on is Jello.
  • hn_throwaway_99 8y ago
    Basically all of your comment is false. Humans can synthesize many amino acids. That is the defining difference between non-essential vs. essential amino acids. And there are lots of plant sources that are missing or insufficient in essential amino acids. Beans, for example, are lacking in methionine, which is why corn and beans are eaten together in some traditional diets.
    • spraak 8y ago
      Sorry, all essential* amino acids come from plants or microbes. Beans, e.g. pinto, do have methionine, but corn has even less, so I don't see your point. Besides, you probably don't want a lot of methionine in your diet (it's linked to feeding cancer) [1..7]. Further, you're recycling the tired myth that "protein comibing" is necessary. Our body maintains pools of free amino acids by dumping protein into the digestive tract, which are broken down and reassembled, i.e. it does the protein combining for us, it's not necessary to explicitly do it through meals if you're otherwise eating a varied diet that sufficient in calories. [1] http://www.ncbi.nlm.nih.gov/pubmed/22171665 http://www.ncbi.nlm.nih.gov/pubmed/22171665 [2] http://www.ncbi.nlm.nih.gov/pubmed/18789600 http://www.ncbi.nlm.nih.gov/pubmed/18789600 [3] http://www.ncbi.nlm.nih.gov/pubmed/15955547 http://www.ncbi.nlm.nih.gov/pubmed/15955547 [4] http://www.ncbi.nlm.nih.gov/pubmed/18252204 http://www.ncbi.nlm.nih.gov/pubmed/18252204 [5] http://www.ncbi.nlm.nih.gov/pubmed/22342103 http://www.ncbi.nlm.nih.gov/pubmed/22342103 [6] http://www.ncbi.nlm.nih.gov/pubmed/11603655 http://www.ncbi.nlm.nih.gov/pubmed/11603655 [7] http://www.ncbi.nlm.nih.gov/pubmed/14585259 http://www.ncbi.nlm.nih.gov/pubmed/14585259
• hkyeti 8y ago
  No, that myth was debunked decades ago. You can get all essential amino acids from a normal variety of plant foods, and the body combines them naturally. Or in case of some all essential amino acids are in the same plant.
  • nec4b 8y ago
    Tell that to the doctors that have to save malnourished vegan children.
• alangpierce 8y ago
  Soylent is vegan and nutritionally complete, so there are definitely cheap-to-produce ways to make it work.