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Fasting
The evening check-in: how Azetta follows your fast
Held or not, hunger, energy, sleep: four answers every evening, and simple rules to tell you to ease off, to keep going or that you are ready to widen. The exact thresholds, and the tips that follow from them.
3 min read Updated October 9, 2026
The principle
A fasting plan only makes sense if it is going well. Rather than guessing, Azetta asks you a few short questions every evening and draws a verdict from them: too early to judge, ease off, keep going, it's going well, or ready to widen. The plan itself never changes on its own: the verdict informs you, you are the one who decides.
The Azetta method
The questions
- Held? yes or no;
- Hunger from 1 (none) to 5 (hard to bear);
- Energy from 1 to 5;
- Sleep from 1 to 5;
- your weight, if you like (between 20 and 400 kg; it is saved as a weigh-in).
The check-in reminder arrives at 21:00; the button appears on the day's card from 20:00.
The tracking
- Streak: the number of days held in a row, counting back from the latest check-in.
- Consistency: days held ÷ check-in days.
- Averages of hunger, energy and sleep (unanswered questions are ignored).
- Weight change: latest weigh-in − first.
The verdict
The share of days held is read over the last 7 check-ins; the averages of hunger and energy, over all your check-ins:
| Verdict | Condition |
|---|---|
| Too early | fewer than 3 check-ins |
| Ease off | average hunger ≥ 4, or average energy ≤ 2, or fewer than half of the last 7 days held |
| Ready to widen | at least 7 check-ins, 85% of the last 7 days held, hunger ≤ 2.5 and energy ≥ 3.5 |
| It's going well | at least 70% of the last 7 days held |
| Keep going | all other cases |
The rules are read in this order: a warning sign always wins over good consistency.
The tips
At most three tips are shown, depending on your situation: an intense session falls in the middle of your fast; you are in your first 4 days (plus a reminder: black coffee, tea and water are fine during the fast, milk, sugar and juices break it); your window opens in less than 90 minutes; it is a light day of 5:2; you ran for 60 minutes or more today; you have drunk less than half of your water goal after 16:00; your average hunger reaches 4; your average sleep is 2 or less; or you are ready to widen.
Why this choice
- Hunger, energy and sleep are the first signs that a meal rhythm doesn't suit you; tracking them from the first days lets you react before giving up.
- Reading consistency over seven days reflects your current week without one isolated bad day weighing too much.
- Leaving the decision to the person stops an algorithm from pushing towards a longer fast: no automatic promotion.
Limits
- Everything relies on how you feel: the app measures neither your blood sugar nor your fatigue.
- The thresholds are caution rules chosen by Azetta, not clinically validated criteria.
- The verdict doesn't look at your training performance.
References
- de Cabo R, Mattson MP. Effects of Intermittent Fasting on Health, Aging, and Disease. New England Journal of Medicine, 2019;381(26):2541-2551.
- Varady KA, Cienfuegos S, Ezpeleta M, Gabel K. Clinical application of intermittent fasting for weight loss: progress and future directions. Nature Reviews Endocrinology, 2022;18(5):309-321.