10 Best Types Of Protein For Intermittent Fasting

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Best Types Of Protein For Intermittent Fasting

Getting enough protein when you’re fasting is critical in ensuring that your intermittent fasting journey is both successful and sustainable.

Whether you’re new to intermittent fasting or a seasoned practitioner, understanding the best types of protein for intermittent fasting can make all the difference.

In this comprehensive guide, we will explore the benefits of a high-protein diet, why you should incorporate it into your fasting routine, how much protein you need daily, the best types of protein, its precautions, and the best practices for consuming protein with intermittent fasting.

Understanding Intermittent Fasting

Let’s start by discussing intermittent fasting (IF) before we delve into the topic of proteins.

Intermittent fasting is a dietary approach that involves cycling between periods of fasting (fasting window), during which you don’t consume any calories, and periods of eating (eating window). It’s gained popularity for its potential health benefits, including weight management and improved metabolism1.

There are different IF methods, such as the 16/8 method (16 hours of fasting and an 8-hour eating window) or the 5:2 method (regular eating for five days and reduced calorie intake for two days). IF is a flexible approach, but it’s important to consider individual factors and consult with a healthcare professional before starting.

Moreover, it’s crucial to be mindful of what you consume during your eating window, especially with regard to protein. While there are no strict limitations on what you can eat, being selective about your food choices and opting for lean, high-quality protein sources can maximize the benefits of your intermittent fasting journey.

Benefits Of A High Protein Diet

Before delving into the specifics of incorporating protein into your intermittent fasting regimen, it’s essential to grasp the numerous benefits of a high-protein diet. While intermittent fasting itself offers various advantages, the combination of fasting with a protein-rich diet can take your health to the next level.

Weight Management

One of the most praised benefits of a high-protein diet is its role in weight management. Protein is known for its ability to increase feelings of fullness and reduce hunger2. When you consume more protein, you are less likely to overeat during your eating windows in an intermittent fasting schedule. This results in a natural reduction in calorie intake, aiding weight loss and weight maintenance.

Muscle Preservation

Fasting can lead to muscle loss if not done correctly. A high protein intake can help counteract this effect. By providing your body with an adequate supply of amino acids, the building blocks of protein, you support muscle preservation during fasting periods. This is particularly important for individuals who engage in strength training or exercise regularly3.

Improved Metabolism

Protein has a thermic effect, meaning it requires more energy to digest and metabolize compared to fats and carbohydrates4. This elevated thermic effect can help boost your metabolism, resulting in increased calorie expenditure. When combined with intermittent fasting, this effect can be even more pronounced.

Blood Sugar Control

High protein diets have been associated with improved blood sugar control5. They help stabilize your blood sugar levels, which is crucial when fasting to prevent energy crashes and maintain your focus and productivity throughout the day.

Enhanced Fat Loss

When you consume a sufficient amount of protein, your body is better equipped to tap into fat stores for energy6. This can aid in fat loss, which is often a primary goal for those following intermittent fasting protocols.

Eating A High-Protein Diet

Now that we’ve covered some of the key benefits of a high-protein diet, you might wonder why it’s essential for your intermittent fasting routine. The answer lies in the harmonious relationship between protein consumption and the fasting approach.


One of the primary challenges during fasting periods is dealing with hunger. A diet rich in protein helps you feel full and satisfied7, making it easier to stick to your fasting schedule. You’re less likely to experience the discomfort of hunger pangs, making fasting more manageable.

Muscle Preservation

As mentioned earlier, a high-protein diet is crucial for preserving lean muscle mass. Intermittent fasting alone can lead to muscle breakdown8, but the combination of fasting with sufficient protein intake can help you maintain your hard-earned muscle.

Energy Levels

Protein provides a stable source of energy, which is especially valuable during fasting periods. Unlike the quick energy spikes and crashes associated with high-carbohydrate meals, protein sustains your energy levels9, helping you stay alert and focused throughout your fast.

Improved Fat Oxidation

Pairing intermittent fasting with a high-protein diet can promote fat oxidation10,11, the process of burning stored fat for energy. This is a key factor in achieving your weight loss goals while preserving muscle mass.

Muscle Growth (if desired)

If you’re looking to build muscle or improve your athletic performance, protein is a fundamental component of your diet. Intermittent fasting can be tailored to support muscle-building goals, and a high protein intake ensures that your body has the necessary nutrients to facilitate muscle growth and repair12.

How Much Protein Do You Need

Determining your daily protein needs is essential when integrating a high-protein diet into your intermittent fasting routine. The right protein intake varies from person to person based on several factors, including age, gender, activity level, and overall health goals.

  • Sedentary Individuals

If you have a sedentary lifestyle, meaning you engage in little to no physical activity, you can aim for the lower end of the protein intake spectrum, which is around 0.8 grams of protein per kilogram of body weight per day13. For example, a 70-kilogram (154-pound) sedentary individual should aim for approximately 56 grams of protein daily.

  • Active Individuals

If you’re physically active and engage in regular exercise or strength training, your protein requirements will be higher. In this case, a range of 1.2 to 1.7 grams of protein per kilogram of body weight per day is a common recommendation14. The lower end of this range is suitable for moderate activity levels, while those with more intense workouts should aim for the higher end.

  • Weight Goals

Your specific weight goals will also influence your protein intake. If you’re looking to lose weight, a slightly higher protein intake may be beneficial. On the other hand, if you’re focusing on muscle gain, you should aim for the upper end of your recommended protein range.

  • Individual Factors

Remember that individual factors play a significant role. It’s always a good idea to consult with a healthcare professional or nutritionist to determine your precise protein needs based on your unique circumstances and goals.

Best Types Of Protein For Intermittent Fasting

With the understanding of the importance of incorporating protein into your intermittent fasting regimen, let’s delve into the best types of protein sources to make the most of your fasting experience.

1. Lean Meats

Lean meats, such as chicken, turkey, and lean cuts of beef or pork, are excellent sources of high-quality protein. They are low in fat and rich in essential amino acids, making them ideal for muscle preservation during fasting periods. Preparing these meats without excessive oil or sauces keeps your calorie intake in check.

2. Fish and Seafood

Fish and seafood are not only packed with protein but also offer essential omega-3 fatty acids, which can benefit heart health. Salmon, mackerel, tuna, and sardines are particularly good choices. These protein sources are not only filling but also promote muscle retention during intermittent fasting.

3. Eggs

Eggs are a versatile and nutrient-dense protein source. They are loaded with essential amino acids and nutrients, including choline and B vitamins. Eating eggs can help you feel full and satisfied during your fasting periods while providing your body with the building blocks it needs.

4. Dairy Products

Dairy products like Greek yogurt, cottage cheese, and low-fat milk are excellent sources of protein. They also contain calcium and other essential nutrients. Greek yogurt, in particular, is a popular choice for those following intermittent fasting, as it can be a satisfying and convenient option during eating windows.

5. Plant-based Proteins

If you follow a vegetarian or vegan intermittent fasting plan, you can still obtain ample protein from plant-based sources. Some of the best options include:

  • Legumes: Lentils, chickpeas, and black beans are rich in protein and fiber, making them excellent for appetite control.
  • Tofu and Tempeh: Soy-based products like tofu and tempeh are complete protein sources and versatile in various dishes.
  • Quinoa: A grain that is a complete protein source, quinoa is a valuable addition to plant-based diets.
  • Nuts and Seeds: Almonds, chia seeds, and pumpkin seeds are protein-packed snacks, although they should be consumed in moderation due to their calorie density.

6. Protein Supplements

Protein supplements, such as whey protein, casein protein, and plant-based protein powders, can be convenient sources of protein during intermittent fasting. They offer a quick and easy way to meet your protein requirements, especially on busy days. However, they should not replace whole food sources entirely, as whole foods provide a broader range of nutrients.

7. Protein-rich Vegetables

Certain vegetables, like broccoli, spinach, and Brussels sprouts, are surprisingly rich in protein. While they may not be the primary source of protein in your diet, they can contribute to your daily intake and enhance the nutritional value of your meals.

8. Protein Bars

Protein bars can be a convenient on-the-go snack to meet your protein needs during intermittent fasting. However, be cautious when selecting protein bars, as some may be high in added sugars and preservatives. Opt for bars with minimal ingredients and balanced macronutrients.

9. Poultry and Lean Meat Alternatives

For those who prefer not to consume traditional meats, there are various alternatives available. Plant-based meat substitutes, like tofu, tempeh, seitan, and mycoprotein, can provide the protein your body needs without animal products.

10. Homemade Smoothies

Homemade protein smoothies give you complete control over the ingredients. Combine protein-rich elements like Greek yogurt, plant-based protein powder, spinach, and fruits to create a delicious, filling, and nutritious meal or snack.

Precautions Against Excessive Protein Intake

While protein is crucial for intermittent fasting, consuming too much can have unintended consequences. Here are precautions to keep in mind:

  • Kidney Health

A diet excessively high in protein can place added stress on the kidneys. To avoid potential kidney issues, moderate your protein intake and ensure your overall diet is well-balanced.

  • Caloric Imbalance

Excess protein can be converted into glucose (via gluconeogenesis) or ketone bodies, potentially leading to a caloric surplus. This is counterproductive if your primary goal is weight loss.

  • Quality Matters

Not all protein sources are created equal. Opt for lean, high-quality protein sources, such as lean meats, fish, poultry, legumes, and plant-based options. Avoid high-fat and processed protein sources.

  • Individual Factors

Remember that individual factors like age, gender, activity level, and health goals influence your protein needs. Consult with a healthcare professional or nutritionist to determine your specific requirements.

Best Practices For Combining Protein With Intermittent Fasting

To make the most of your intermittent fasting journey while enjoying the benefits of protein, follow these best practices:

Quality Over Quantity

Prioritize the quality of your protein sources. Lean meats, fish, plant-based proteins, and low-fat dairy are excellent choices. These options offer essential nutrients without excessive calories.

Timing Matters

Plan your protein intake strategically. Consume protein-rich meals during your eating window to maximize muscle preservation, satiety, and energy levels while fasting.

Avoid Overconsumption

Keep an eye on portion sizes. While protein is essential, excessive intake can lead to unwanted consequences. Balance your protein intake with other macronutrients.


Protein-rich diets can be dehydrating, so drink plenty of water. Staying well-hydrated helps your body process protein and maintain overall health.

Monitor Your Progress

Track your progress throughout your intermittent fasting journey. Adjust your protein intake as needed based on your goals and how your body responds.

To Wrap It Up

Protein becomes a beneficial partner in your intermittent fasting journey, aiding in muscle retention, promoting a sense of fullness, and facilitating weight management. Nonetheless, it’s crucial to maintain moderation and harmony. By being mindful of avoiding excessive protein intake and following recommended practices, you can enhance your intermittent fasting experience, enhance your overall health, and effectively reach your wellness objectives.


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2 Pesta, D. H., & Samuel, V. T. (2014). A high-protein diet for reducing body fat: mechanisms and possible caveats. Nutrition & metabolism, 11(1), 53. https://doi.org/10.1186/1743-7075-11-53

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9 Institute of Medicine (US) Committee on Military Nutrition Research; Marriott BM, editor. Food Components to Enhance Performance: An Evaluation of Potential Performance-Enhancing Food Components for Operational Rations. Washington (DC): National Academies Press (US); 1994. 17, Carbohydrates, Protein,, and Performance. Available from: https://www.ncbi.nlm.nih.gov/books/NBK209054/

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