strict diet

Translations
строгая диета
He is on a strict diet to lose weight.
Он на строгой диете, чтобы похудеть.
Definitions
A strict diet refers to a carefully controlled eating plan that limits certain foods or food groups, often with specific goals in mind such as weight loss, health improvement, or adherence to dietary restrictions.
Words
strict

adjective
строгий
diet

noun
диета