Table 1.

Definition of terms used to describe different types of fasting or calorie restricted eating patterns (adapted from [76]).

Eating Patterns	Definition
Intermittent Fasting	Involves fasting for varying periods of time, typically for at least 12 h or longer.
Time Restricted Eating	Involves restricting food intake to specific time periods of the day, typically between an 8–12 h period each day (e.g., 16:8, involving 16 h fasting and an 8 h eating window)
Alternate Day Fasting	Involves consuming no calories on fasting days and alternating fasting days with a day of unrestricted food intake or “feast” day
Alternate Day Modified Fasting	Involves consuming less than 25% of baseline energy needs on “fasting” days, alternate with a day of unrestricted food intake or “feast” day
Periodic Fasting	Consists of fasting only 1 or 2 days a week and consuming food ad libitum on 5 to 6 days per week.
Fasting Mimicking Diet	Consists of a very low calorie (usually high fat) diet designed to replicate a fasting state, often done periodically or in cycles.