expression, noun
barometer of health; measure of good health
Used figuratively to describe something that indicates or reflects one's health status, such as a habit, symptom, or daily condition.
毎朝の体重測定は健康のバロメーターだ。
Weighing myself every morning is a barometer of my health.
肌の調子は健康のバロメーターと言われる。
The condition of your skin is said to be a barometer of your health.