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Types of intermittent fasting.
| Types | Description | Fasting definition | Normal eating | Reference |
| Alternate day fasting | Fasting alternated with a day of normal eating | 0–25% of TCN* | ad libitum | (105) |
| 5:2 diet or periodic fasting | Fasting for 2 days with normal eating for 5 days | 0–25% of TCN* | ad libitum | |
| Time-restricted feeding | Normal eating within a window of < 8 h per day | – | ad libitum |
*TCN, total caloric needs.
