View Full Version : Freezing Yogurt and L. Acidophilus

04-22-2005, 06:13 AM

I did a search for this in google and on the boards here but couldn't find anything for this specifically. I eat a lot of yogurt a day, probably 3-4 cups. I like to freeze it and eat it by itself, but does this freezing kill the L. Acidophilus and other cultures in the yogurt, or make it less effective? If it does, I'll have to eat it w/o freezing it.

thx in advance if anyone knows.

04-22-2005, 09:34 AM
I think it would

04-28-2005, 02:31 PM
There is no RDA for Lactobacillus Acidophilus, but experts recommend that you obtain 3-5 billion live organisms of L. Acidophilus to maintain colon health, and to combat digestive upset. Since bacteria are not measured by weight, such as in milligrams (mg) or grams (g) as you usually see supplements listed, it is measured by number. This can be taken either in supplement form or within foods that contain L. Acidophilus, such as yogurt, some milks, miso and tempeh. However, be sure to check to see if your favorite brand of yogurt adds the live cultures only after pasteurization as the high temperatures will kill the bacteria. Check the date on the yogurt or acidophilus milk to make sure it is still good. Keep in mind that freezing temperatures also kill the bacteria.

Found the answer to me own question. Dammit! No more freezing the yogurt. Son of a...

04-28-2005, 05:38 PM
I didn't think much of anything could live in a freezer

04-28-2005, 08:44 PM
Freezing kills most parasites but does not kill bacteria. It simply halts or slows down their growth. Your yogurt is fine.


04-29-2005, 06:41 AM
well now I'm confused because this site clearly states that freezing temps. kills them.


It's where I got the quote. Page 2. I'll have to read some more. I did think it was strange though, since E. Coli is a bacteria (I think) and you hear about ppl getting it from fast food chains. I know they freeze their stuff before serving it.

04-29-2005, 06:48 AM
I hate stupid sites that claim bs things like "It will kill them." I thought it was legit. Here's a link to a study done on probiotics in ice cream. Freezing for long periods of time seems to decrease the numbers of effective bacteria (or something like that) but that was after like 17 weeks in the freezer.

Now whether to trust this link or not, who knows.


04-29-2005, 08:49 AM
well, so far in my searches, i haven't found anything that i would say "this site is credible, and they say 'x' ". I've found a few from universities, but no big schools... however, i'm more likely to believe universities than food producers.

I'm more likely to believe that it's possible to kill bacteria by freezing it, but it would take more of a freezer than you and I have in our kitchens. I would think it would have to do with crystalizing EVERY water molecule, and rupturing the bacteria themselves; sorta like eating a previously frozen orange... it's all mushy. I would also guess it would render whatever food unedible.

Freezing, as our fridges do it, only slows down / stops decomposition and bacterial growth.


Vapour Trails
04-29-2005, 11:03 AM
I'm a microbiologist and I can tell you without a doubt that freezing does not kill bacteria.

04-29-2005, 12:26 PM
^ There's your answer.