5 Best Smoothie Ingredients For Intermittent Fasting

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Best Smoothie Ingredients For Intermittent Fasting

Intermittent fasting is one of the popular strategies on the journey towards improved health and a balanced lifestyle. It’s a dietary approach that alternates between periods of eating and fasting, and it has shown numerous potential benefits, including weight management and improved metabolism. As a valuable tool in the intermittent fasting toolkit, smoothies offer a delicious and nutritious way to break your fast or maintain your energy levels during fasting hours.

In this article, we’ll explore the best smoothie ingredients for intermittent fasting to help you make the most of your weight loss journey, ensuring that your taste buds are satisfied while your health goals are met.

What Is Intermittent Fasting?

Intermittent fasting has emerged as a widely embraced and effective method for achieving weight loss and enhancing overall well-being. This approach entails alternating periods of fasting and eating windows, offering a range of potential benefits wherein it can help you lose weight, insulin sensitivity improvement, inflammation reduction, cognitive function enhancement, and potential lifespan extension1.

The most common practice involves dividing the day or week into these alternating phases. Various fasting methods exist, such as the 16/8 regimen, the 5:2 approach, alternate-day fasting, and 24-hour fasting2.

Nevertheless, it is crucial to emphasize that a fundamental element of any intermittent fasting regimen is the complete avoidance of calorie intake or a significant reduction in caloric consumption during fasting hours. This restriction prompts the body to transition from utilizing glucose as its primary energy source to burning stored fat, which can facilitate weight loss and contribute to overall health enhancement3.

However, it is essential to acknowledge that intermittent fasting might not be suitable for everyone, particularly individuals with specific medical conditions, or those who are pregnant or breastfeeding. Therefore, it is advisable to consult with a healthcare professional before embarking on any new diet or exercise regimen.

Furthermore, attuning to your body’s signals and making necessary adjustments to your fasting schedule is of paramount importance. Should any adverse side effects emerge, such as dizziness, headaches, or extreme hunger, these may indicate a need to modify the fasting plan or potentially discontinue it altogether. It is important to emphasize that the objective of intermittent fasting is to bolster your health rather than compromise it.

Benefits Of Intermittent Fasting

The advantages of intermittent fasting extend beyond mere weight loss, although weight management remains the primary motivation for most individuals adopting this dietary approach. A comprehensive review conducted in 2014 revealed that intermittent fasting can lead to a significant reduction in body weight, ranging from three to eight percent over periods spanning three to 24 weeks4, a remarkable achievement when compared to findings from other studies.

Furthermore, this same study indicated that participants experienced a substantial decrease in waist circumference, shedding approximately four to seven percent of belly fat. This is particularly noteworthy because excess abdominal fat is known to contribute to health issues such as heart disease, diabetes, and liver complications5.

However, the merits of intermittent fasting go beyond shedding pounds. Scientific research suggests that it can also mitigate insulin resistance, enhance cardiovascular health, lower inflammation levels, and promote optimal brain function4,6,7,8.

In animal studies, intermittent fasting has even demonstrated the potential to extend lifespan and act as a preventative measure against cancer8,9.

An often underestimated benefit of intermittent fasting is the valuable gift of additional time and increased productivity. During fasting periods, the time that would typically be allocated to meal preparation and consumption can be redirected to other activities, optimizing one’s daily schedule.

Does Drinking Smoothies Break Your Fast?

While smoothies cannot be consumed during a fasting period, they serve as an excellent tool for concluding a fast thoughtfully. Let’s delve into the reasons behind this choice.

When the moment arrives to break your fast, the primary objective is to reintroduce nourishment in a gradual manner, minimizing strain on the digestive system and blood sugar levels. The ideal choices for this phase involve foods and beverages that are rich in protein and healthy fats, as they possess low sugar content and a dense calorie profile10. These fundamental nutrients function harmoniously to provide a sensation of fullness without overwhelming the digestive process.

Another favorable option is the inclusion of low-glycemic foods and beverages, as they contribute to a sense of satiety without imposing undue stress on digestion or causing adverse fluctuations in blood sugar levels11. Suitable low-glycemic selections encompass non-starchy vegetables, specific fruits, and items such as sweet potatoes12.

Smoothies seem to be the perfect tool for this gentle transition from fasting. When appropriately prepared, they have the potential to quell your hunger, elevate your energy levels, and maintain blood sugar equilibrium. The blending process renders them more easily digestible, enhancing the overall experience.

It is prudent to exercise caution and refrain from incorporating excessive amounts of fruit or other high-carb ingredients into your smoothie, as this may lead to a turbulent blood sugar ride, elevated insulin production, feelings of discomfort, and increased hunger.

Instead, aim to enrich your smoothie with ample healthy fats and protein, a substantial portion of non-starchy vegetables, and some low-sugar fruits. The most effective smoothie for concluding an intermittent fast is one that remains uncomplicated, health-conscious, and gentle on the digestive system.

Types Of Intermittent Fasting Smoothies

When considering the incorporation of smoothies into your intermittent fasting regimen, it’s advisable to opt for recipes that are characterized by a low carbohydrate content, a high protein component, and the inclusion of healthy fats. There are various smoothie variations that align with the principles of intermittent fasting, including green smoothies, protein-infused smoothies, keto-friendly smoothies, and those with minimal sugar content.

Green smoothies typically consist of leafy greens, low-sugar fruits, and a base of either coconut water or almond milk. Protein smoothies combine protein powder with low-carb fruits and vegetables. Keto smoothies are crafted using high-fat ingredients such as avocado, coconut milk, nut butter, and low-carb berries. Lastly, low-sugar smoothies feature low-glycemic fruits like berries, along with the inclusion of seeds, nuts, and unsweetened almond milk.

Best Smoothie Ingredients For Intermittent Fasting

As intermittent fasting primarily focuses on when to eat rather than specific dietary choices, questions often arise regarding suitable food choices during fasting periods.

Smoothies, as previously mentioned, serve as an ideal means to break the fast and commence the eating window in a nourishing manner. Not only are smoothies a highly nutritious way to introduce calories, but they also offer full customization to cater to individual preferences.

If you’re making your own smoothies, you might be thinking about how to create the best ones. To get started, let’s categorize basic ingredients mentioned earlier to include in a balanced and healthy smoothie recipe:

1. Protein: Enhance your smoothies with proteins such as Greek yogurt, protein powder, or cottage cheese. The addition of protein promotes a longer-lasting sense of fullness and helps regulate insulin levels13. When selecting protein powder, opt for unsweetened or low-sugar options, as the market offers many protein powders containing substantial sugar content.

2. Liquid Base: The liquid base is an essential component of any smoothie. It can range from the basic, like water, to more nutrient-dense options. Consider low-sugar liquids such as milk, coconut milk, or unsweetened almond milk. For a savory twist, bone broth may even be used as a base.

3. Fruits And/Or Vegetables: Variety is key in any diet. Choose fruits with lower sugar content and higher fiber, such as berries, to minimize blood sugar spikes compared to high-sugar fruits like watermelon. Berries, when integrated into a balanced diet, have been shown to reduce insulin resistance in individuals with diabetes14,15,16. Vegetables are excellent smoothie additions, particularly if they’re not a regular part of your diet. Leafy greens, cooked beets, celery, and cooked carrots can be seamlessly incorporated into smoothies without sacrificing flavor.

4. Healthy Fats: A well-rounded smoothie necessitates the inclusion of healthy fats17. Nut butter, chia seeds, flax seeds, pumpkin seeds, or avocados offer sources of essential fats like omega-3s.

5. Sweetener (Optional): To enhance flavor or make certain ingredient combinations more palatable, some individuals may opt to introduce sweeteners into their smoothies. The necessity for sweeteners varies based on personal preference, as the inherent sweetness of fruits in the smoothie can suffice. For those who wish to add sweeteners, a modest amount of maple syrup, honey, or a preferred sweetener can be utilized to tailor the smoothie’s taste according to individual preferences.


In conclusion, selecting the right ingredients for your smoothies while practicing intermittent fasting is a great way to get and ensure a successful and health-conscious journey.

Smoothies, when prepared mindfully, can serve as an effective tool for breaking a fast, offering a gradual reentry to nourishment while avoiding sudden spikes in blood sugar.

To make the most of your intermittent fasting experience, prioritize ingredients that are low in carbohydrates, rich in protein, and incorporate healthy fats. Whether you opt for a green smoothie, a protein-packed concoction, a keto-friendly blend, or a low-sugar option, the key is to keep your smoothie simple, nutrient-dense, and easy on your digestive system.

By making thoughtful choices and paying attention to the ingredients you include, you can ensure that your smoothies complement your fasting routine and contribute to your overall well-being. Remember, the best smoothie for intermittent fasting is one that aligns with your health goals, keeps you satisfied, and aids in a smooth transition from fasting to eating.


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2 Zang B-Y, He L-X, Xue L. Intermittent Fasting: Potential Bridge of Obesity and Diabetes to Health? Nutrients. 2022; 14(5):981. https://doi.org/10.3390/nu14050981

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7 Varady, K. A., Bhutani, S., Church, E., & Klempel, M. C. (2009). Short-term modified alternate-day fasting: a novel dietary strategy for weight loss and cardioprotection in obese adults. The American Journal of Clinical Nutrition, 90(5), 1138–1143. https://doi.org/10.3945/ajcn.2009.28380

8 Lee, J. Y., Duan, W., Long, J. M., Ingram, D. K., & Mattson, M. P. (2000). Dietary restriction increases the number of newly generated neural cells, and induces BDNF expression, in the dentate gyrus of rats. Journal of Molecular Neuroscience, 15(2), 99–108. https://doi.org/10.1385/jmn:15:2:99

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11 Sagili, V. S., Chakrabarti, P., Jayanty, S. S., Kardile, H. B., & Sathuvalli, V. (2022). The Glycemic Index and Human Health with an Emphasis on Potatoes. Foods, 11(15), 2302. https://doi.org/10.3390/foods11152302

12 Glycemic Index Guide. (2023, June 8). Low Glycemic Index (GI) foods List. Complete information. https://glycemic-index.net/low-glycemic-index-foods/

13 Comerford, K. B., & Pasin, G. (2016). Emerging evidence for the importance of dietary protein source on glucoregulatory markers and type 2 diabetes: Different effects of dairy, meat, fish, egg, and plant protein foods. Nutrients, 8(8), 446. https://doi.org/10.3390/nu8080446

14 Stull, A. J. (2016). Blueberries’ impact on insulin resistance and glucose intolerance. Antioxidants, 5(4), 44. https://doi.org/10.3390/antiox5040044

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17 Kurti, S. P., Wisseman, B., Akers, J. D., & Edwards, E. S. (2023). Saturated fatty acids consumed in smoothies increase glucose and metabolic load index in young adults compared to polyunsaturated Omega-3-Fatty acids. Nutrients, 15(3), 642. https://doi.org/10.3390/nu15030642


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