18:6 Fasting Schedule: A Step Up from 16:8
18:6 extends the daily fast by two hours, deepening ketosis and pushing growth hormone higher. It's the natural next step for someone who has been doing 16:8 for a few weeks and wants more metabolic benefit without committing to OMAD.
How 18:6 works
Common eating windows are 13:00–19:00 or 12:00–18:00. Two meals fit comfortably; some people eat one large meal plus a smaller closer. Black coffee, tea, and water are fine outside the window. Add a pinch of sea salt to morning water if you get headaches in the first week.
A sample day
- 07:00Wake up. Water + electrolyte pinch.
- 10:00Black coffee. Water.
- 13:00Break fast: protein + vegetables + complex carb.
- 16:30Smaller second meal: yogurt, fruit, nuts.
- 19:00Close eating window.
- 19:00–13:00Fasting window. Water and unsweetened tea.
What happens in your body
Physiological milestones reached during a 18-hour fast.
- h4
Blood sugar normalizes
Insulin drops back to baseline as your last meal finishes digesting.
- h8
Glycogen burning begins
Your liver starts releasing stored glycogen to keep blood glucose steady.
- h12
Glycogen depletion
Liver glycogen runs low; the body shifts toward fat for fuel.
- h14
Fat burning accelerates
Lipolysis ramps up — stored triglycerides break down into free fatty acids.
- h16
Mild ketosis starts
The liver begins producing ketones from fatty acids. Mental clarity often improves here.
- h18
Growth hormone rises
HGH increases up to 5×, supporting muscle preservation and tissue repair.
What to eat
Six hours leaves less margin for poor choices, so prioritize density: a fist of protein, half a plate of non-starchy vegetables, a fist of carbs around training, a thumb of healthy fat. Drink ~2.5 L of water across the day to stay ahead of dehydration.
How to break the fast
- Bowl of vegetable curry with chicken and rice
- Steak with sweet potato and broccoli
- Tofu stir-fry with quinoa
- Greek salad with grilled fish
Who it's for
- • Intermediate fasters comfortable with 16:8
- • People targeting steady fat loss
- • Those who naturally don't want breakfast
Benefits
- • Reaches mild ketosis reliably most days
- • Higher growth-hormone surge than 16:8
- • Two meals fit comfortably in 6 hours
Risks & cautions
- • Hunger waves at hours 14–17 are common in the first week
- • Not for people with a history of disordered eating
- • Watch sodium and magnesium intake; deficiency symptoms appear faster than on 16:8
Frequently asked questions
Is 18:6 better than 16:8 for fat loss?
Should I take electrolytes on 18:6?
Can I drink bone broth during the fasting window?
How is 18:6 different from OMAD?
Related schedules
Track your 18:6 fast in QoFast
Live timer, milestone tracking, water and electrolyte logging — free on iOS & Android.
