English quotes 英文谚语 九 An apple a day keeps the doctor away.（在线收听）

"An apple a day keeps the doctor away."
How should we eat to stay healthy? What do you think is the most healthy food we can eat every day? Do you eat very healthy foods? Or do you prefer delicious but not-so-healthy foods? What foods should we avoid eating? Besides eating well, what should we do for our health?