Mi Yodeya is a question and answer site for those who base their lives on Jewish law and tradition and anyone interested in learning more. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I was wondering if sucking your own blood or biting at your own scab or otherwise consuming yourself was halachically permissible, since, as far as I can tell, humans are not kosher. Even so, it would seem that autocannibalism in some form or another is basically unavoidable and I have never heard of it being prohibited.

share|improve this question
dailyhalacha.com/… – Hacham Gabriel Feb 29 '12 at 3:01
Related: judaism.stackexchange.com/q/1680/128 – yydl Feb 29 '12 at 20:31
humans aren't technically not kosher – Baby Seal May 20 '14 at 2:23
up vote 5 down vote accepted

Shulchan Aruch, Yoreh De'ah 66:10 (from Kerisus 21b) states:

"Human blood, if it is separated from his body, is forbidden because of appearances (maris ayin). Thus, if one bit into a piece of bread and blood came out from his gums onto it, he must scrape that portion off. On the other hand, if it is still between one's teeth, he may suck it out."

Rashi to Kerisus there explains that the essential distinction isn't really between whether the blood is visible to others (as on the bread) or not (as in the gums), but just whether it is separated from its place of origin. So it sounds like sucking any kind of wound would be okay under the laws of kashrus, although there might be the consideration of "bal teshaktzu" - not eating disgusting things (Yoreh De'ah 116:6).

share|improve this answer
So, if I understand correctly, sucking directly from the wound or biting directly off of a scab is ok, but consuming blood or scab bits from a finger that picked it would not be allowed? – Peter Olson Feb 29 '12 at 1:19
@PeterOlson: seems so, yes. (Again, though, there may be the consideration in your first case of bal teshaktzu - not a kashrus issue, but an important one nonetheless.) – Alex Feb 29 '12 at 3:37

Alex beat me by a minute here, but nonetheless:

The Talmud talks about all sorts of things!

Interestingly enough, the Biblical prohibition on non-kosher animals doesn't apply to humans. (Hence, all human milk is theoretically kosher.)

However if you have a cup of blood sitting on the table here, the rabbis of the Talmud said don't drink it. Even if it's human blood and theoretically not prohibited, people would think you're drinking cow blood or the like (which is Biblically prohibited). So the rabbinic prohibition kicks in if the blood has separated from the host body. Hence:

(Ketubot 60a):

כדתניא דם שעל גבי ככר גוררו ואוכלו שבין השינים מוצצו ואינו חושש

If you find [human] blood on your bread, scrape off the blood and eat the remaining bread. If there's blood between your teeth, suck on it all you like.

share|improve this answer

I put together a source sheet on the subject of cannibalism for a shiur I gave. I don't have time at the moment to sum it up, but I'll link you and explain it later http://www.scribd.com/doc/59902674/cannibalismchabura

share|improve this answer
Aqibha Y. Weisinger Etc, thank you for the link, and welcome to the site! I hope you stick around and enjoy it. As you realize, the answer will be much improved when you summarize in it the parts of that chabura that answer this question. – msh210 Feb 29 '12 at 17:54

I posted an article here in which the conclusion I came to was that in many circumstances it can theoretically be permitted to consume human blood. While the purpose of that article was to be humorous (it was Purim time) I think the argument is technically pretty sound.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.