What is casein?

Casein is like the glue that holds milk together, it’s one of the main proteins in milk.

Imagine you're playing with playdough. The playdough is soft and squishy, but if you leave it out for a while, it starts to harden. That's kind of what happens with casein. When milk is left sitting or heated, the casein proteins clump together, making curds, like when you make cheese!

In milk, casein floats around in tiny groups called micelles. These are like little bubbles that keep the milk smooth and creamy. But if something changes, like adding an acid or heat, those bubbles start to break apart. The casein then sticks together, making a solid part of the milk.

You can see this when you make cheese at home. When you add lemon juice to milk, it turns into a lumpy mixture, that’s casein doing its job!

So next time you drink milk or eat cheese, remember: casein is like the glue holding everything together, and sometimes it likes to turn into curds and play with your food! Casein is like the glue that holds milk together, it’s one of the main proteins in milk.

Imagine you're playing with playdough. The playdough is soft and squishy, but if you leave it out for a while, it starts to harden. That's kind of what happens with casein. When milk is left sitting or heated, the casein proteins clump together, making curds, like when you make cheese!