12/12 intermittent fasting: the best place to start
Before 16/8 there's 12/12: 12 hours eating, 12 hours fasting. The perfect first step to get going without the struggle.
Part of the complete guide How to start intermittent fasting and pick your protocol
What the science says12-Hour Fast (12/12): How to Start and Benefits
12/12 fasting means fitting all your meals into 12 hours and fasting the other 12, sleep included. It's the gentlest entry point to intermittent fasting: just move dinner earlier or breakfast later. Observational data link an overnight fast of at least 13 hours with better blood sugar control and more hours of sleep.
- Among 2,413 women with breast cancer, fasting less than 13 h overnight was associated with a 36% higher risk of recurrence (HR 1.36) (Marinac 2016). [1]
- Each extra 2 h of overnight fasting was associated with lower HbA1c and longer sleep duration (Marinac 2016). [1]
- Half of adults ate across more than 14.75 h a day; cutting the window to 10-11 h for 16 weeks reduced body weight (Gill and Panda 2015). [2]
What 12/12 fasting is
12/12 fasting splits your day in half: 12 hours when you eat and 12 hours when you fast. Since you're asleep for about 8 of those hours, in practice you just stop eating a couple of hours before bed and push breakfast a little later.
Why it's the best starting point
The mistake a lot of people make is jumping straight to 16/8 and quitting three days later because they're starving. 12/12 gets your body used to going hours without food and you barely notice. It's sustainable from day one.
Sample 12/12 schedule
- Dinner at 8:00 pm → stop eating.
- Breakfast at 8:00 am → open your eating window.
- 12 hours of fasting done with almost no effort.
How to go from 12/12 to 16/8
Once 12/12 feels easy (1-2 weeks), push breakfast back 30 minutes every few days: 12/12 → 13/11 → 14/10 → 16/8. No big jumps, and your body adapts to using fat as fuel.
How Ayúname helps
Ayúname lets you set a 12/12 window and stretch it little by little. The timer makes your progress visible so you don't quit right when it starts working.
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Frequently asked questions
Does 12/12 fasting work for weight loss?
Is 12/12 fasting good for beginners?
Scientific sources (3)
- Prolonged Nightly Fasting and Breast Cancer Prognosis. JAMA Oncology, 2016.
- A Smartphone App Reveals Erratic Diurnal Eating Patterns in Humans that Can Be Modulated for Health Benefits. Cell Metabolism, 2015.
- Ten-Hour Time-Restricted Eating Reduces Weight, Blood Pressure, and Atherogenic Lipids in Patients with Metabolic Syndrome. Cell Metabolism, 2020.