Table 1.

Classification of intermittent fasting.

English name	Abbreviation	Definition description
Alternate-day fasting	ADF	It consists of “eating days” (eating normally or consuming 125 to 150 percent of the calories required for a regular diet) and “fasting days” (fasting for 24 hours or limiting energy intake to 25 percent or less), which do not restrict overall calorie intake but only change the frequency of eating.
Time-restricted fasting	TRF	It allows energy intake freely within a controlled period (usually 3-12 h per day).
Modified fasting	MF	① ADF-25% (fasting day 25% CR); ② ADF-50% (fasting day 50% CR); ➂ ADF-100% (fasting day 100% CR)
Fasting-mimicking diet	FMD	Five-day monthly meal plan: limit 1.1 kcal calories on the first day and 0.75 kcal on the second to five days, and eat the rest of the time freely.