A 16/8 intermittent fasting schedule means fasting for 16 hours and eating during an 8-hour window. For example, you might eat from 11 a.m. to 7 p.m., then fast from 7 p.m. to 11 a.m. the next day.
16/8 is common, but it is not the only schedule and it is not automatically right for everyone. Many beginners do better starting with 12:12 or 14:10 before trying 16/8.[1][2]
Key takeaways
- 16/8 means a 16-hour fasting window plus an 8-hour eating window.
- The exact clock time can shift as long as the fasting length and eating window stay clear enough to repeat.
- Water, black coffee, and unsweetened tea are the simplest fasting-window drinks.[1]
- Choose a gentler plan or get medical guidance first if you have diabetes, medications that require food, pregnancy, breastfeeding, underweight status, eating-disorder risk, or a medical condition.[3]
- Stop or shorten the fast if symptoms feel persistent, severe, or unsafe.[4]
Table of Contents
- Key takeaways
- 16/8 schedule examples
- Who may do better with 16/8
- When to choose a gentler schedule or get guidance
- How to start a 16/8 schedule
- What to eat during the 8-hour window
- How GoFasting can support a 16/8 routine
- Who may 16/8 fit, and who may need a different schedule?
- FAQ
- Bottom line
- Medical disclaimer
- References
16/8 schedule examples
| Eating window | Fasting window | Better fit |
|---|---|---|
| 8 a.m. to 4 p.m. | 4 p.m. to 8 a.m. | Early eaters or people who prefer breakfast |
| 10 a.m. to 6 p.m. | 6 p.m. to 10 a.m. | People who want lunch and an earlier dinner |
| 11 a.m. to 7 p.m. | 7 p.m. to 11 a.m. | Common workday routine |
| 12 p.m. to 8 p.m. | 8 p.m. to 12 p.m. | People who prefer later meals |
A good starting clock time is one that lets you eat balanced meals without rushing, skipping medication instructions, or pushing through warning symptoms.
For help comparing schedules, read How to choose your plan?.
Who may do better with 16/8
16/8 may be more reasonable if you:
- Already handle a 12- to 14-hour overnight fast comfortably
- Can fit enough balanced food into 8 hours
- Do not need food during the fasting window for medications
- Can keep hydration steady when fluids are allowed
- Can step back to 14:10 if symptoms appear
If 16/8 makes you overeat when the window opens, skip meals you need, or feel unwell, the schedule is too strict for now.
When to choose a gentler schedule or get guidance
Do not treat 16/8 as a self-guided challenge if fasting conflicts with your health context. Choose a gentler plan or talk with a qualified professional first if you:
- Have diabetes, kidney disease, or another chronic medical condition
- Take medications that need food or affect blood sugar, blood pressure, or fluids
- Are pregnant, breastfeeding, underweight, recovering from illness or surgery, or have eating-disorder risk
- Develop dizziness, headaches, persistent digestive symptoms, unusual fatigue, mood changes, or feeling out of control around food
Intermittent fasting is not for everyone, and side effects can include tiredness, dizziness, headaches, mood changes, constipation, and menstrual effects.[4]
How to start a 16/8 schedule
- Begin with your current overnight gap between dinner and breakfast.
- Move to 12:12 for a few days if you are new to fasting.
- Try 14:10 before 16/8 if 12:12 feels easy.
- Choose an 8-hour eating window that fits two meals, or two meals plus a snack.
- Keep fasting-window drinks simple: water, black coffee, or unsweetened tea.[1]
- Review how you feel after one to two weeks before making the plan stricter.
Longer fasts are not automatically better, and some longer fasts may be dangerous for some people.[1]
What to eat during the 8-hour window
The eating window should support the routine rather than compensate for the fast. Build meals around protein foods, vegetables, fruit, whole grains or other fiber-rich carbohydrates, and healthy fats.[5]
Simple examples:
- First meal: eggs, vegetables, fruit, and whole-grain toast
- Snack: Greek yogurt with berries, or hummus with vegetables
- Final meal: beans, tofu, fish, or chicken with vegetables and rice, quinoa, or potatoes
This article stays focused on schedule. If you want a food plan, use a dedicated meal-plan article instead.
How GoFasting can support a 16/8 routine
If you are testing 14:10 before 16/8, GoFasting can help you compare fasting windows and review whether your routine is becoming easier to repeat. It can also help you log fasting windows, weight, steps, calorie intake, and water intake.
Tracking can make the experiment clearer, but it does not decide whether fasting is medically appropriate.
Who may 16/8 fit, and who may need a different schedule?
A 16/8 schedule may fit people who already do well with a shorter overnight fast and can eat balanced meals within eight hours. It may not be the right first step if it causes rebound eating, poor sleep, dizziness, or stress around food.
| 16/8 may fit if... | Choose another option if... |
|---|---|
| You already tolerate 12:12 or 14:10 | You are skipping meals and then overeating |
| You can eat enough protein, fiber, and fluids | The window makes meals rushed or too small |
| Your daily schedule supports an eight-hour window | Medication timing or blood-sugar concerns apply |
| The routine feels repeatable after a trial week | Pregnancy, breastfeeding, eating-disorder risk, or medical conditions apply |
FAQ
What is the 16/8 intermittent fasting schedule?
It is a daily pattern with 16 hours of fasting and 8 hours for eating. A common example is eating from 11 a.m. to 7 p.m. and fasting from 7 p.m. to 11 a.m.
Do fasting times have to be fixed every day?
Not always. Many people do better with a consistent fasting length and a flexible clock time. For more detail, read Do fasting times have to be fixed every day.
Can beginners start with 16/8?
Some can, but many beginners do better with 12:12 or 14:10 first.[1][2] A gentler start helps you learn drink boundaries, meal timing, and symptom signals.
What can I drink during 16/8 fasting?
Water, black coffee, and unsweetened tea are the simplest default examples.[1] For more detail, read What other drinks can you drink?.
Is 16/8 better than 14:10?
Not automatically. 16/8 is more restrictive. If 14:10 is easier to repeat and supports balanced meals, it may be the better routine for you.
Bottom line
A 16/8 intermittent fasting schedule can be a clear daily routine, but it should not be forced. Start gently, protect balanced meals and hydration, and step back if symptoms, medication needs, or eating patterns make the schedule a poor fit.
Medical disclaimer
This article is for general educational purposes only and is not medical advice. Talk with a qualified health care professional before starting 16/8 fasting if you have a medical condition, take medications, are pregnant or breastfeeding, are underweight, have a history of an eating disorder, or feel unwell while fasting.
References
- Johns Hopkins Medicine. Intermittent Fasting: What Is It, And How Does It Work? https://www.hopkinsmedicine.org/health/expert-qa/intermittent-fasting-what-is-it-and-how-does-it-work
- Cleveland Clinic. Intermittent Fasting: What It Is, Benefits and Schedules https://health.clevelandclinic.org/intermittent-fasting-4-different-types-explained
- Cleveland Clinic. 6 Tips for Fasting Safely https://health.clevelandclinic.org/tips-for-fasting-the-healthy-way
- Mayo Clinic. Intermittent fasting: What are the benefits? https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/intermittent-fasting/faq-20441303
- CDC. Tips for Healthy Eating for a Healthy Weight https://www.cdc.gov/healthy-weight-growth/healthy-eating/index.html