an ounce of prevention is worth a pound of cure

Translations
грамм профилактики стоит килограмма лечения
She always says that an ounce of prevention is worth a pound of cure when it comes to health.
Она всегда говорит, что грамм профилактики стоит килограмма лечения, когда речь идет о здоровье.
Definitions
This phrase means that taking proactive measures to prevent a problem is more effective and less costly than dealing with the consequences of that problem after it occurs.