Article: HOW STUFF WORKS: Soy milk and tofu come from beans

What's soy milk?

To make it, you start with half a cup of dried soybeans soaked in water for half a day. Then they're ground up in a blender and the bean pulp is boiled. The pulp is then filtered out with a cloth and, voila, the liquid left behind is soy milk.

It's a lot like cow's milk. One cup of "2 percent" cow's milk contains about 5 grams of fat (in the form of cream) per cup.

Soy milk also contains about 5 grams of fat (in the form of soybean oil) per cup. Cow's milk has about 8 grams of dairy protein, while soy milk has about 7 grams of vegetable protein.

Making soy milk is very inexpensive compared to cow's milk - about $1 a gallon. If you buy the beans in bulk, you can push the ...

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