Ketogenic Diets

Ketogenic diet is a very-low-carbohydrate diet but high in fat, typically 70–90%
Zhu et al. 2022 Signal Transduct. Target. Ther. 7: 11

It is one way beyond calorie restriction that carbohydrates can be limited

There are several types of ketogenic diets that vary in their approach and goals.

see also:
Classic ketogenic diet (4:1) / Standard ketogenic diet (SKD)