Calorie restriction

Calorie restriction means reducing average daily caloric intake below what is typical or habitual, without malnutrition or deprivation of essential nutrients. In a fasting diet, a person does not eat at all or severely limits intake during certain times of the day, week, or month.

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Calorie restriction and fasting diets: What do we know? 

https://www.nia.nih.gov/news/calorie-restriction-and-fasting-diets-what-do-we-know#:~:text=Calorie%20restriction%20means%20reducing%20average,day%2C%20week%2C%20or%20month.