During intermittent fasting, you can eat nutrient-dense foods — lean proteins, vegetables, fruits, whole grains, and unsaturated fats — during your eating window. During the fasting window, stick to zero-calorie beverages such as water and black coffee. The goal is to make the most of your eating window with foods that support satiety and nutritional balance.
Intermittent fasting is an eating pattern that cycles between periods of fasting and eating. It does not specify exactly which foods you should eat, but rather when you should eat them. Whether you are following intermittent fasting rules for the first time or looking for a structured intermittent fasting food plan, understanding what to consume during your eating window can help you maintain a balanced diet and support your everyday routine (1).
This article is for informational purposes only and does not constitute medical advice. Intermittent fasting may not be suitable for everyone. Always consult a qualified healthcare provider before making changes to your dietary routine.
Intermittent Fasting Schedules at a Glance
There are several different types of fasting, each with its own intermittent fasting schedule. The right choice depends on your lifestyle, preferences, and how long you can comfortably maintain a fasting window. Below is a brief overview of the most common methods.
| Method | Fasting Hours | Eating Window | Notes |
|---|---|---|---|
| 12:12 | 12 hours | 12 hours | A common starting point for intermittent fasting for beginners. Often involves fasting overnight. |
| 14:10 | 14 hours | 10 hours | A slightly longer fast that remains manageable for many daily routines. |
| 16:8 | 16 hours | 8 hours | One of the most widely practiced methods. For example, eating between 12 PM and 8 PM. |
| 5:2 | Varies | Varies | Eating normally for 5 days a week and limiting caloric intake on the other 2 days. |
| OMAD | 23 hours | 1 hour | One Meal A Day. A more advanced approach that requires careful nutritional planning. |
Each method has its own intermittent fasting hours and structure. A 2024 scoping review of meal patterns and time-restricted eating found that most intermittent fasting approaches share the principle of limiting the eating window, with the 16:8 method among the most commonly studied (1).
Can You Eat Anything During Intermittent Fasting?
Technically, yes — but only during your eating windows. Intermittent fasting does not strictly restrict specific food groups. However, to get the most out of your eating window, available evidence suggests focusing on whole, minimally processed foods (1).
For example, if you follow a 16-hour fast with an 8-hour eating window (16:8), you can consume your daily meals and snacks within those 8 hours. While you could technically eat anything, prioritizing nutrient-dense options helps ensure you meet your nutritional needs and maintain steady energy throughout the day.
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What Foods Should You Eat During Intermittent Fasting?
When considering fasting food ideas and foods you can eat while fasting, focus on items that provide sustained energy, essential nutrients, and satiety. The following table summarizes the key food categories and examples.
| Category | Examples | Notes |
|---|---|---|
| Lean Proteins | Chicken breast, fish, tofu, legumes, eggs | Support satiety and help maintain muscle mass during caloric restriction (2). |
| Unsaturated Fats | Olive oil, avocados, nuts, seeds, fatty fish | Provide slow-releasing energy and may support cardiovascular function (3). |
| Complex Carbohydrates | Oats, quinoa, brown rice, sweet potatoes | Offer dietary fiber for steady energy and support digestive function (4). |
| Fruits & Vegetables | Berries, leafy greens, broccoli, apples, citrus | Rich in vitamins, minerals, and antioxidants to support overall nutritional status (5). |
Proteins
Including adequate protein in your meals is important when following any intermittent fasting plan. Research indicates that protein intake can enhance feelings of fullness and support appetite regulation, which may be particularly beneficial when managing hunger between eating windows (2). Good sources include lean meats, fish, eggs, legumes, and plant-based proteins such as tofu and tempeh.
Fruits and Vegetables
Fruits and vegetables are foundational to a balanced diet. They provide essential micronutrients, antioxidants, and dietary fiber. A 2024 review found that consistent fruit and vegetable intake supports gastrointestinal function and contributes to overall nutritional status (5). Aim to include a variety of colors and types to maximize micronutrient diversity.
Unsaturated Fats
Incorporating beneficial fats — such as those found in olive oil, avocados, and nuts — can help keep you satisfied during your eating window. Research on omega-3 and polyunsaturated fatty acids has explored their role in supporting cardiovascular function and lipid metabolism (3). These fats are also a source of fat-soluble vitamins.
Whole Grains
Whole grains are a nutrient-dense choice for your intermittent fasting food plan. They provide the body with slow-releasing energy, which can be beneficial during your fast. A 2024 systematic review and meta-analysis found that whole grain consumption supports a more stable glycemic response compared to refined carbohydrates (4). Examples include oats, quinoa, brown rice, and whole-grain bread.
Read more: Intermittent Fasting Meals That Will Fit Your 16/8 Schedule
What Can You Drink During Intermittent Fasting?
One of the most common questions about intermittent fasting is about liquids to drink while fasting. During the fasting window, it is important to stick to zero-calorie beverages to maintain the fasted state.
Water is the most important beverage. Staying well-hydrated can help manage feelings of hunger. Research suggests that adequate water intake may support appetite regulation and is associated with lower meal energy intake (6).
If you are wondering about coffee during intermittent fasting, black coffee is a suitable option. You can drink black coffee without breaking your fast, as it contains negligible calories. Plain herbal teas and sparkling water are also acceptable during the fasting window.
However, adding milk, cream, sugar, or flavored syrups introduces calories and macronutrients that will break the fast. If you prefer to drink coffee while fasting, keep it plain.
Consequences of Nutrient-Poor Choices During Eating Windows
While intermittent fasting focuses on when you eat, what you eat still matters. Relying on highly processed foods during your eating window can lead to several challenges that may affect your experience with the fasting approach.
Increased Cravings
Foods high in refined sugars can cause rapid fluctuations in blood sugar, which may lead to increased hunger and cravings during your fasting period. Choosing complex carbohydrates and protein-rich foods can help maintain more stable energy levels.
Poor Nutritional Status
Failing to consume adequate vitamins and minerals during your eating window can affect your overall nutritional status. This may impact energy levels and immune function over time. Prioritizing a variety of whole foods helps ensure you meet your micronutrient needs within a potentially shorter eating window.
Digestive Discomfort
A diet low in dietary fiber can contribute to digestive discomfort. Ensuring adequate fiber intake from whole plant foods — such as vegetables, fruits, legumes, and whole grains — supports regular digestion and gut function (5).
Association with Chronic Conditions
A diet high in ultra-processed foods, added sugars, and saturated fats has been associated in research with a higher risk of certain chronic conditions (7). An umbrella review published in 2024 found consistent associations between ultra-processed food intake and adverse health outcomes across multiple meta-analyses (7).
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What Foods Should You Avoid During Intermittent Fasting?
To maximize the nutritional value of your eating window, there are certain items you may want to limit. The following table outlines key categories of foods to avoid while intermittent fasting.
| Category | Examples | Reason to Limit |
|---|---|---|
| Sugary Drinks & Snacks | Soda, sweetened juices, candy, pastries | Provide empty calories and may cause rapid blood sugar fluctuations. |
| Processed Meats | Bacon, sausages, hot dogs, deli meats | High consumption has been associated with cardiovascular risk in research (8). |
| Fried Foods | French fries, fried chicken, doughnuts | Often high in saturated fats and calories with low nutritional value. |
| Refined Grains | White bread, white pasta, white rice | Lack dietary fiber and essential nutrients compared to whole-grain alternatives. |
| High-Sodium Foods | Canned soups, salty snacks, fast food | Excessive sodium intake has been linked to elevated blood pressure in research (9). |
These foods to avoid while intermittent fasting are not strictly prohibited, but limiting them can help ensure that your eating window provides the nutritional value your body needs.
Can I Eat Pizza During Intermittent Fasting?
Yes, you can eat pizza during your eating window if it fits within your overall nutritional goals. Intermittent fasting is flexible when it comes to food choices. However, for sustained energy throughout the day, you might consider pairing a slice with a side salad, opting for a whole-grain crust, or adding vegetable toppings to increase the fiber and micronutrient content of the meal.
Want to build a consistent routine around your fasting schedule? The BetterMe app offers structured plans and meal ideas to support your goals.
What Not To Do In Intermittent Fasting?
To make your fasting experience more manageable, try to avoid these common mistakes when following intermittent fasting rules:
Eating during the fasting period: Stick to zero-calorie beverages during your fasting window. Even small caloric intakes can break the fast and interrupt the metabolic shift associated with fasting.
Not drinking enough water: Dehydration can be mistaken for hunger. Aim to drink water consistently throughout the day, including during the fasting window (6).
Overeating during the eating window: It can be tempting to compensate for the fasting period by eating large amounts. Focus on nutrient-dense choices rather than trying to make up for missed meals.
Ignoring nutritional variety: Eating the same foods repeatedly may lead to gaps in micronutrient intake. Aim for a varied diet that includes proteins, complex carbohydrates, unsaturated fats, and a wide range of fruits and vegetables.
Not consulting a healthcare provider: Before starting any fasting regimen, especially if you have underlying conditions or take medication, consult a qualified healthcare provider for personalized guidance.
Read more: A Beginner Intermittent Fasting Meal Plan To Fit Your IF Journey
Frequently Asked Questions
What are the common challenges of 16/8 fasting?
If you are not seeing the progress you expect with a 16-hour fast with an 8-hour eating window (16:8), it may be due to consuming too many calories during your eating window, choosing highly processed foods, or not getting enough physical activity. Evaluating your overall dietary pattern and food choices can help. A 2025 systematic review found that intermittent fasting strategies show comparable outcomes to continuous energy restriction for body weight management (1).
What happens after 16 hours of fasting?
After approximately 16 hours of fasting, your body may shift to using stored energy sources as glycogen levels deplete. This metabolic shift — sometimes referred to as the transition to fat oxidation — is one of the reasons people practice extended fasting windows. The degree and timing of this shift can vary depending on individual factors such as activity level and prior dietary patterns.
Can I drink coffee and milk during intermittent fasting? Does milk in coffee break intermittent fasting?
You can drink black coffee during your fasting window without breaking your fast. However, adding milk will break your fast. Milk contains calories and macronutrients — including protein and carbohydrates — that initiate the digestive process and interrupt the fasted state. If you are fasting to support autophagy or maintain a strict fasted state, it is best to stick to plain black coffee or water during the fasting window.
What not to do in intermittent fasting?
The most common mistakes include eating during the fasting window, not staying hydrated, overeating during the eating window, and failing to prioritize nutrient-dense foods. See the dedicated section above for a full breakdown.
This article is for informational purposes only and does not constitute medical advice. Intermittent fasting may not be suitable for everyone. Always consult a qualified healthcare provider before making changes to your dietary routine.
The Bottom Line
Intermittent fasting for beginners and experienced individuals alike is about finding a sustainable routine. By focusing on nutrient-dense foods — lean proteins, unsaturated fats, complex carbohydrates, and a wide variety of fruits and vegetables — during your eating window, and staying hydrated with zero-calorie beverages during your fasting window, you can support a more structured eating routine and overall nutritional balance. Remember to listen to your body, choose foods that provide sustained energy, and adjust your intermittent fasting plan as needed over time.
DISCLAIMER:
This article is intended for general informational purposes only and does not serve to address individual circumstances. It is not a substitute for professional advice or help and should not be relied on for making any kind of decision-making. Any action taken as a direct or indirect result of the information in this article is entirely at your own risk and is your sole responsibility.
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You should always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or your specific situation. Never disregard professional medical advice or delay seeking it because of BetterMe content. If you suspect or think you may have a medical emergency, call your doctor.
SOURCES:
- Meal patterns, including intermittent fasting–a scoping review for Nordic Nutrition Recommendations 2023 (2024, Food & Nutrition Research)
- Dietary strategies for appetite regulation: satiety and obesity management (2025, Food & Function)
- Effects of omega-3 fatty acids on coronary revascularization and cardiovascular events: a meta-analysis (2024, European Journal of Preventive Cardiology)
- Effects of whole grains on glycemic control: a systematic review and dose-response meta-analysis (2024, Nutrition Journal)
- Effect of Fruit and Vegetable Consumption on Human Health (2024, Foods)
- Water intake, hydration, and weight management: the glass is half-full! (2025, Physiology & Behavior)
- Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses (2024, BMJ)
- Associations of the consumption of unprocessed red meat and processed meat with the incidence of cardiovascular disease and mortality (2023, Critical Reviews in Food Science and Nutrition)
- Association Between Changes in Salt Intake and Blood Pressure: A Systematic Review and Meta-Analysis (2024, Nutrition Reviews)
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