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Part of it is probably due to the bacterial fermentation: acid is produced, which clots the milk just like if you let it go sour.

The proteins start clinging to each other and also absorb more water.

However, I find commercial yogurt is also heated, further denaturing the proteins and making the product more thick than home-made yogurt ever gets.

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13y ago
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14y ago

The thickness of yogurt is largely due to moisture; most recipes call for straining the yogurt in a cloth to remove excess water which makes it more viscous. It may be that Stonyfield Farm makes their yogurt with less water than most. Powdered milk can also be used thicken yogurt.

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12y ago

Bacteria has got in in to it and has curdled it.

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13y ago

If you look at the yogurt, you'll notice that it's thicker. When you add something thick to something light, it will get thicker.

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Q: When you add yogurt to milk why does it get thicker?
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The antibiotics prevent the growth of the bacteria that is needed to make the milk become yogurt.


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How do you make yogurt from sour milk?

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