They are very healthy.

In English, they are healthy, which means they are healthy.

Examples are as follows:

Although my uncle is old, he looks very strong and healthy.

Although my uncle is old, he still looks strong.

I find it interesting and healthy to climb mountains.

I think mountain climbing is both interesting and healthy.

You don't have to spend a lot of money on delicious food for your family, okay? Healthy? Meals.

It doesn't cost much to let a family eat delicious and healthy meals.

A diet lacking nutritional value won't raise a person? Healthy.

Drinks without nutritional value cannot maintain health.

Mary gave birth to one? Healthy? Baby girl.

Mary gave birth to a healthy baby girl.