Cleanse
16:8 Fasting With Juice: The Daily Window
16:8 is the simplest fasting pattern there is: you eat within an eight-hour window and leave the other sixteen hours food-free, most of which is overnight anyway. There's no plan to buy, just a shape for your day. Here is how it works, where juice fits and how to turn it into an easy habit.
What 16:8 Actually Is
16:8 just means you fit all your eating into an eight-hour window and fast for the other sixteen. Say your window runs from midday to eight in the evening: you eat normally in that stretch, then nothing but water until noon the next day. The numbers look dramatic until you remember that most of those sixteen hours are spent asleep.
There is nothing to buy and no rulebook to follow. It is simply a shape for your day, which is exactly why it is the easiest fasting pattern to start with. It is one of the three we set out in intermittent fasting with juice and the gentlest to fold into normal life.
Why It's the Simplest to Sustain
The reason 16:8 sticks is that it barely asks anything of you. You are already fasting overnight, so all you are really doing is nudging breakfast later or dinner earlier to widen that natural gap. For most people that means skipping breakfast, having a late lunch as the first meal and finishing dinner a little earlier. No special food, no lighter days, no counting.
Because it is a daily rhythm rather than an occasional event, it becomes second nature quickly. Once your body adjusts to eating in a set window, the morning hunger that catches people out early on tends to fade and the whole thing runs on autopilot.
How Juice Works With 16:8
Juice slots into 16:8 in two ways. Inside your eating window, a cold-pressed juice is a light, easy option among your meals. And as your window opens, a juice is a gentle way to break the overnight fast before a full meal, easier on the system than diving straight into something heavy.
Strictly speaking, juice has calories, so a purist would count it as ending a fast rather than something you drink during one. For a gentle, juice-supported approach that hardly matters, but if you want the full nuance, we cover it in does juice break a fast.
What a 16:8 Day Looks Like
There's no single right window, but here is one common shape, a midday-to-eight window, to show how it fits together.
| Time | What |
|---|---|
| Morning | Water, plus black coffee or herbal tea if you have it |
| Midday | Open your window, a cold-pressed juice or a light first meal |
| Afternoon | Lunch and a juice or snack within the window |
| Around 8pm | Dinner, the last of your eating window |
| Overnight | Window closed, water only until midday, most of it asleep |
Shift the window to suit your life. If you would rather eat breakfast, run it earlier, say nine to five and skip the evening meal instead. The hours are yours to set.
How to Make It a Habit
Two things make 16:8 effortless. First, pick a window that genuinely fits your routine rather than one you have to fight, if you love breakfast, do not choose a window that cuts it out. Second, be consistent rather than strict: keeping roughly the same window most days matters far more than hitting the exact minute and the odd off day changes nothing.
Don't obsess over the clock. 16:8 is meant to make life simpler, not add a rule to stress about. Drink plenty of water, let the window flex when you need it to and it quietly becomes just how you eat. There's more on turning it into a lasting rhythm in making fasting a lifestyle.
Who Should Skip It
Even the gentlest fasting pattern isn't for everyone. Please skip 16:8 and speak to your GP first if you are pregnant or breastfeeding, under 18, on medication that needs to be taken with food, managing diabetes or your blood sugar, underweight, or if you have any history of disordered eating. And a note on the point of it: 16:8 is a rest from food, not a diet, so if the scales are your only reason for doing it, it is worth a rethink. The wider safety guidance is in are juice cleanses safe.
Juice for Your Window
Something light for inside the window, or a gentler pattern to ease in with (or browse all our cleanse and fasting guides):
Frequently Asked
What does 16:8 mean?
You fit all your eating into an eight-hour window and fast for the other sixteen hours. A common window is midday to eight in the evening, with water only until noon the next day. Most of the fasting stretch is overnight, which is what makes it manageable.
Is 16:8 the easiest fasting pattern?
For most people, yes. There's nothing to buy and no lighter days, you just nudge breakfast later or dinner earlier to widen your natural overnight gap. Because it's a daily rhythm, it becomes second nature quickly.
Can I drink juice during my fasting hours?
Juice has calories, so strictly a purist would count it as breaking the fast rather than something you sip through it. For a gentle, juice-supported approach that hardly matters. The full nuance is in does juice break a fast.
What can I have in the morning before my window opens?
Water and black coffee or herbal tea if you have them, none of which have any real calories. Keep the morning simple and let a cold-pressed juice or a light meal open your window at midday.
What if I slip up on the timing?
Nothing at all. Consistency matters far more than precision, so keeping roughly the same window most days is what counts and the odd off day changes nothing. 16:8 is meant to simplify your eating, not add a rule to stress over.
Is 16:8 safe for everyone?
No. Skip it and speak to your GP first if you are pregnant or breastfeeding, under 18, on medication that needs food, managing diabetes or blood sugar, underweight, or with any history of disordered eating. It is a rest from food, not a diet, so treat it as a gentle habit.
The Bottom Line
16:8 is the simplest fasting pattern going: eat within an eight-hour window, fast the other sixteen, most of it while you sleep. There's nothing to buy and no counting, just a shape for your day. Pick a window that fits your life, stay roughly consistent, let juice make it easier and it quietly becomes just how you eat.
Want a light option for your window? A half-day plan is a close cousin and the rest of the cleanse and fasting hub covers the other patterns.
Where to Start
Browse the full range in the cleanse and fast shop, or go straight to Juice 'Til Dinner, the 5:2 Juice Plan or the Signature Cleanse.
Related reading
- 5:2 juice fasting
- Alternate-day fasting with juice
- OMAD with juice
- The 24-hour juice fast
- Does juice break a fast?
- Making fasting a lifestyle
- How often should you cleanse?
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