Cow’s milk has calcium, and calcium is good for our bones. We could all probably repeat this in our sleep.
But why does cow’s milk have calcium? Where does it come from? Does the cow make the calcium in her body somehow? Or, maybe it’s possible that like human mothers, she must eat a healthy diet so that she can stay healthy and make milk with all the nutrients her baby needs? After a quick thought, it’s probably not surprising that this is the case. The mother cow must eat enough calcium in order for her to give it to her baby, or anyone else who wants to drink her milk.

Stay with me here, because this is where it gets interesting. Think about what human mothers do when they are breast feeding – ensure a healthy diet, and take supplements if they aren’t getting enough of certain nutrients, right? And sure enough, so do cows. Cows are meant to eat grass, which is a green vegetable filled with calcium – a mineral that comes from the soil (like all minerals). Even if a cow eats grass sometimes, the soil usually doesn’t have enough because of how intensely the land is used. If a cow doesn’t get enough calcium from food, they make less milk or can even get very sick. This would not be good so:

Cows take calcium supplements because they don’t get enough of it in their food to ensure they are healthy while giving all that milk.

The question: If cows take calcium supplements because they don’t eat enough green vegetables, can’t I eat more green vegetables or take a calcium supplement instead of drinking her milk?

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