心宽体胖 Relaxed and well-fed
Explanation
形容人心情愉快，没有烦心事，因而身体也长得胖。
Describes someone who is in a good mood, has no worries, and therefore is also physically well-fed.
Origin Story
从前，有个秀才，一直为科举考试而焦虑，日渐消瘦。后来，他决定放下包袱，不再执着于功名利禄，反而心态平和，每日读书习字，饮食规律，竟不知不觉地长胖了。一日，一位老友来访，见到他如此心宽体胖，不禁赞叹道：“你如今心宽体胖，气色真好！可见，人生在世，心宽最重要啊！”秀才深以为然，从此更加豁达乐观。
Once upon a time, there was a scholar who was always anxious about the imperial examinations and was getting thinner and thinner. Later, he decided to let go of his burdens and no longer cling to fame and fortune, but rather maintain a peaceful mentality. He read and practiced calligraphy daily, ate regularly, and unknowingly gained weight. One day, an old friend came to visit. Seeing him so relaxed and well-fed, he couldn't help but exclaim: "You are so relaxed and well-fed, you look so good! It can be seen that in life, peace of mind is most important!" The scholar agreed wholeheartedly and became even more open-minded and optimistic.
Usage
常用作谓语、定语，形容人心情舒畅，身体健康。
Often used as a predicate or attribute to describe a person who feels comfortable and healthy.
Examples
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他心宽体胖，一点儿也不为这事儿担心。
tā xīn kuān tǐ pàng, yīdiǎnr yě bù wèi zhè shìr dānxīn。
He is so relaxed and well-fed, he doesn't worry about this matter at all.
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你看他心宽体胖的，就知道他过得很幸福。
nǐ kàn tā xīn kuān tǐ pàng de, jiù zhīdào tā guò de hěn xìngfú。
You can tell from his relaxed and well-fed appearance that he lives a happy life