This is the 10937th most frequent Russian word.
высококалорийную
High-calorie.
The adjective 'высококалорийную' describes the food (пищу) by its calorie content, indicating that the food mentioned is high in calories.
Я предпочитаю есть менее высококалорийную пищу.
I prefer to eat less high-calorie food.
Here, 'высококалорийную' is used to characterize the food prepared, emphasizing the quality of being high-calorie.
Вчера я приготовил для гостей высококалорийную пищу.
Yesterday, I prepared high-calorie food for the guests.
In this sentence, 'высококалорийная' modifies the noun 'диета' to describe the diet type that is essential for athletes, implying it has a high calorie content.