Humans need calcium and vitamin D to keep bones healthy.
it is healthy for humans to eat fat because they need it for insulation.
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Humans need calcium to keep their bones healthy. Calcium is found in dairy products,mainly milk, and is also added to many manufactured foods.
So we don't die.
you need to not eat junk food to keep your heart healthy
they need them to keep healthy?
We need vitamins to keep our body strong and healthy.
They help you to keep a healthy diet.
Hydration
animals need water to keep them hydrated, healthy and alive.
To keep your heart healthy you need to exercise regularly, avoid fatty food, eat healthy and no smoking!