1. healthy 有两个意思，一是指“人本身健康的”，二是指“有益于健康的”。如：
Good food keeps you healthy. 好的饮食使你健康。
Cycling is certainly healthier than driving. 骑车肯定比开车有利于健康。
有时用于比喻义。如：
That book is not healthy reading for children. 那本书供小孩读不健康。
2. healthful通常只表示“有益于健康的”。如：
Doing morning exercises is very healthful. 做早操对健康很有益。
Why don’t you eat such healthy [healthful] foods? 你为什么不吃那些有益于健康的食物?
此词在现代英语中用得不多（已属过时用法），一般用healthy代替。
I try to eat healthy foods that have good nutrition.
我尽量食用富含营养的健康食品。
Her refusal of fast food is due to her healthy eating habits.
因为她遵从健康的饮食习惯，所以拒绝吃快餐食品。
Have some healthy food instead of hamburgers.
吃点健康食品，别再吃汉堡包了。
Doing exercise and keeping a healthy diet have become my everyday life.
锻炼和坚持健康的饮食已经成为了我的日常生活。
He looks healthy.
他看上去很健康。
※A good healthy body is worth more a crown in gold. 健康的身体贵于黄金铸成的皇冠。
※The love of beauty is an essential part of all healthy human nature. 爱美是所有健康人天性中的一个重要部分。
※The love of beauty is an essential part of all healthy human nature.——John Ruskin, American writer and critic爱美是健康人性的重要组成部分。美国作家、批评家 罗斯金 J
