The phrase "controlled diet" refers to a type of eating plan where a person carefully monitors and limits their food intake in order to achieve certain health goals, like losing weight or managing a medical condition. Full definition
When all mice were adults, they were fed the same control diet for the remainder of their lives. (sciencedaily.com)
I'm on a calorie controlled diet whilst training so that's why I would need them! (deliciouslyella.com)
You should discuss dietary concerns with your veterinarian, including the possibility of feeding a weight control diet if needed. (cat-lovers-only.com)