How does fermented milk differ from regular milk?
Fermented milk is milk that has been soured on purpose by lactic acid bacteria, which makes it thicker, tangier and more acidic than regular milk. Yogurt and kefir are examples. Regular milk is just pasteurized milk with no fermentation.
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In this article
What is the difference between fermented milk and regular milk?
Regular milk is pasteurized and sold as it is. Fermented milk starts as milk but is cultured with lactic acid bacteria, which turn part of the milk sugar (lactose) into lactic acid. That changes the taste, texture and acidity.
| Regular milk | Fermented milk | |
|---|---|---|
| Process | Pasteurized | Milk cultured with bacteria |
| Taste | Mild, slightly sweet | Tangy, sour |
| Texture | Thin liquid | Thicker, from drinkable to spoonable |
| Acidity | Near neutral | Acidic |
| Examples | Whole, semi-skimmed | Yogurt, kefir, buttermilk, piimä, lassi |
How are examples defined?
In the US, the FDA standard for yogurt (21 CFR 131.200) says it is made by fermenting milk ingredients with a starter culture that includes Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus. The dairy ingredients must be pasteurized or ultra-pasteurized before culturing, yogurt must have a pH of 4.6 or lower, and the standard sets a minimum of 3.25 percent milkfat (lower-fat versions are covered by separate rules). Other fermented milks such as kefir use different cultures.
Is fermented milk easier to digest?
Some people with lactose intolerance tolerate yogurt or kefir better than milk, because part of the lactose has been converted. This varies from person to person and by product, so we cannot promise it. Ask a doctor or dietitian if you have a milk allergy, which fermentation does not remove.
Does fermented milk keep longer?
The acid slows spoilage of some organisms, which is why people soured milk for centuries. Still, store it in the fridge and follow the date on the pack.
Is fermented milk the same as spoiled milk?
No. Fermented milk is soured by chosen cultures and made safely. Milk that has gone bad on its own smells off and should be thrown out. Do not try to ferment milk that has already spoiled.
People also ask
What is fermented milk?
Milk that has been cultured with lactic acid bacteria, making it thicker and more acidic. Yogurt and kefir are common examples.
Is yogurt fermented milk?
Yes. The FDA defines yogurt as milk ingredients fermented with starter cultures including Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus.
Is fermented milk the same as sour milk?
Not exactly. Fermented milk is soured on purpose with chosen bacteria; spoiled milk has soured by accident and may be unsafe.
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