Health
Intermittent Fasting Window Planner
Your eating window, fasting times, and optimal wake-up schedule.
In this article
Benefits of intermittent fasting
Research supports IF for weight loss, insulin sensitivity improvement, and potential longevity benefits via autophagy (cellular cleanup) that activates after ~14–16 hours of fasting.
Choosing your protocol
- 16:8: Most sustainable, great starting point
- 18:6: Better weight loss, harder to maintain socially
- OMAD: Most aggressive, requires careful nutrition planning
- 5:2: Two 500-calorie days/week — good for social eaters
⚡ CalcWolf Insight
A 2019 New England Journal of Medicine review found intermittent fasting improved oxidative stress markers independent of weight loss.
Frequently asked questions
When does fat burning start during fasting?▾
Glycogen depletion begins around 12–14 hours. Ketone production (fat burning) increases significantly after 16+ hours. Maximum autophagy: 18–24+ hours.
Is intermittent fasting safe for everyone?▾
IF is not recommended for pregnant or breastfeeding women, people with a history of eating disorders, type 1 diabetics, children and teenagers, or people taking medications that require food. Consult a doctor before starting if you have any chronic health condition.
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