Sirach 30:25

25 A cheerful and good heart will have a care of his meat and diet.

Sirach 30:25 In-Context

23 Love thine own soul, and comfort thy heart, remove sorrow far from thee: for sorrow hath killed many, and there is no profit therein.
24 Envy and wrath shorten the life, and carefulness bringeth age before the time.
25 A cheerful and good heart will have a care of his meat and diet.

The Brenton translation of the Septuagint is in the public domain.