This is the 5876th most frequent Russian word.
рацион
"Ration" or "diet."
Here, 'рацион' is used to denote the planned set of food items one consumes as part of a dietary routine.
На завтрак у меня в рационе есть яйца.
For breakfast, I have eggs in my diet.
In this sentence, 'рацион' refers to the food composition or feeding habits of birds.
Рацион птиц сильно зависит от сезона.
The diet of birds heavily depends on the season.
This use illustrates 'рацион' being used to describe someone's dietary habits or choices.