Loopa tracks fasts up to 40 days. The presets go 16:8, 18:6, 20:4, OMAD, 24 hours, 48 hours, 3 days and 7 days, and a custom duration reaches 40 days. Anything of 48 hours or more shows a health notice first.
The presets
| Preset | Fast | Health notice |
|---|---|---|
| 16:8 | 16 hours | No |
| 18:6 | 18 hours | No |
| 20:4 | 20 hours | No |
| OMAD | 23 hours | No |
| 24 hours | 1 day | No |
| 48 hours | 2 days | Yes |
| 3 days · 72h | 3 days | Yes |
| 7 days | 1 week | Yes |
| Custom | 1 hour to 40 days | Yes at 48 hours and over |
Custom durations are set in hours below three days and in whole days at or above it. A picker offering four hundred individual hours is one nobody can land on the value they meant, and "nine days and seven hours" is not a duration anybody chooses on purpose.
The health notice
A fast of 48 hours or more shows a notice before it starts. See Health notices for what it says, how the record works, and how to withdraw one.
You will be asked each time you start a long fast, not once.
While a long fast is running
A hydration and electrolyte reminder stays on the fasting screen for the whole fast. It is not dismissable, because the advice does not stop applying on day three. That is when it starts to matter.
One reminder a day, if you already have notifications turned on. Loopa will not ask you for notification permission because you started a fast.
Ending the fast is one tap, in the same place it always is, above the reminder.
Your calorie target for the day is zero. Every preset here is a full day or longer, so there is nothing to spend and Loopa does not show you a number to spend it against. The ring, Add Food, your macros and every coach all read the same way. It comes back the moment you end the fast. Water, activity, weight, habits and your streak are unaffected throughout. Sub-day patterns like 16:8, 18:6, 20:4 and OMAD keep their target, because there is a meal in each of them.
The timer reads in days. Past two days the clock shows something like 3d 04:12:33 rather than 76:12:33, because a three-figure hour count is a number you have to do arithmetic on.
In your history and your streak
A multi-day fast counts on every day it covered, not only the day it ended. A 72-hour fast that finished at noon puts twelve hours on today, a full day on each of the two before, and twelve on the day before those. Your weekly chart shows the shape of the week rather than one spike and six empty bars.
A fast that is still running counts too, up to right now. Four days into a week-long fast, the chart shows four days of fasting.
Days across a daylight-saving change are however many hours they really were (23 on the day the clocks go forward, 25 on the day they go back).
Your streak counts every day a fast covered, and a running fast counts once it has passed its target.
A fast already running is unaffected
If you were mid-fast when this arrived, nothing changed about it. Your target, your start time and your progress are exactly as they were.
Fasting is not for everyone
Talk to a clinician before an extended fast, and especially if you are pregnant or nursing, under 18, underweight, diabetic, on medication, or have any history of disordered eating. Loopa is a general wellness product and none of this is medical advice.
The US National Institute on Aging's review of calorie restriction and fasting diets advises talking with your healthcare provider about the benefits and risks before making any significant change to your eating pattern (https://www.nia.nih.gov/health/calorie-restriction-and-fasting-diets-what-do-we-know).
See also
