Healthy (adjective)

1. Having good physical or mental health.
2. Conducive to good health.
3. Having or showing a normal or adequate amount of physical or mental health.

Origin:

From middle english helthe, from old english hǣlþ, hǣlðe; akin to old high german heilīga health, old english hāl whole.

Examples:

1. Eating a healthy diet is important for good health.
2. She has a healthy appreciation of good food.
3. The children looked healthy and happy.
4. A healthy amount of exercise is good for you.
5. The lake was surrounded by healthy trees and plants.