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William Read - Nutrition Consultant
William is from Canada, he is passionate nutrition & wellness writer. William understands that the topic of wellness is still not well understood, so his goal is to enlighten and teach people how to live healthier and happier in their bodies.

The Science Behind Does Fasting Affect Blood Pressure

Table Of Contents

Can Fasting Cause High Blood Pressure?

Hypertension, commonly understood as high blood pressure, is a serious medical condition affecting many individuals globally. Understanding how fasting can influence blood pressure is vital for making informed decisions about your diet and lifestyle. So let’s delve into the matter and explore what the research says.

When done under supervision and control, fasting has been linked to weight loss, enhanced insulin sensitivity, and reduced inflammation. However, the effects of fasting on blood pressure can vary depending on individual circumstances.

Short-term Effects

Some studies suggest that short-term fasting, such as intermittent fasting, may temporarily increase blood pressure. This can be attributed to the body’s stress response, which releases hormones like adrenaline. However, it’s important to note that this rise in blood pressure is usually modest and transient.

Long-term Effects

Limited research exists on its direct effects on blood pressure regarding long-term or extended fasting periods. However, sustained weight loss from fasting can positively impact blood pressure levels. It’s widely recognized that obesity increases the risk of developing hypertension. However, regularly fasting can be an effective way to lose weight and ultimately lower blood pressure.

Also, read – Can You Drink Tea While Fasting

Considerations & Fasting and Blood Pressure

1. Hydration: Hydration is essential during fasting, as dehydration can potentially affect blood pressure. Drink adequate water throughout the day and consider incorporating meals with high water content.

2. Nutrient Intake: Ensuring you’re still getting adequate nutrients is essential while fasting. Opt for nutrient-dense foods during your eating window to support overall health and prevent nutrient deficiencies.

3. Balanced Eating Patterns: When breaking your fast, choose a balanced meal that includes lean proteins, whole grains, fruits, vegetables, and healthy fats. This can help provide essential nutrients while minimizing the risk of post-meal blood pressure spikes.

How Fasting Affects Heart and Blood Pressure

Fasting is the process of not eating for a set period. This allows the body to cleanse itself of toxins and other unnecessary materials. We can do it for different reasons, including purging, weight loss, detoxification, and simply feeling better in general.

Does intermittent fasting lower blood pressure? Sure, it lowers blood pressure by reducing food and stimulating our bodies to produce less salt in the blood. However, other changes besides these two factors may lower blood pressure.

does fasting lower blood pressure

Fasting Effect on Blood Pressure –  Long-Term Benefits 

Weight Loss

Fasting can promote weight loss, which impacts blood pressure positively. Excess body weight is often linked to higher blood pressure levels, and shedding pounds through fasting can help reduce hypertension risk over time.

Insulin Acuity

Research has proven fasting can enhance insulin sensitivity, a crucial factor in regulating blood sugar levels and maintaining overall health. Improved insulin sensitivity may contribute to better blood pressure control, as insulin resistance is associated with hypertension.

Reduced Inflammation

Chronic inflammation is a risk factor for hypertension. Fasting has been found to reduce inflammation markers in the body, potentially benefiting blood pressure regulation.

Improved Lipid Profile

Fasting can positively impact lipid profiles by reducing total cholesterol, LDL cholesterol (the “bad” cholesterol), and triglyceride levels. This can improve cardiovascular health, including blood pressure management.

Enhanced Autophagy

Autophagy is the body’s natural cellular recycling process, which removes damaged cells and supports cellular health. Fasting stimulates autophagy, which may have cardiovascular benefits, including blood pressure control.

Balanced Sodium Intake

During fasting, you consume less processed and packaged foods, often high in sodium. Avoiding these foods can reduce sodium intake, vital for maintaining healthy blood pressure levels.

Lowered Sympathetic Nervous System Activity

Fasting has been found to decrease sympathetic nervous system activity. This reduction can help relax blood vessels, improving blood flow and lowering blood pressure.

Improved Endothelial Function

The inner lining of blood vessels, endothelium, significantly affects regulating blood pressure. Fasting has positively affected endothelial function, possibly contributing to better blood pressure control and cardiovascular health.

Reduced Oxidative Stress

Research has shown that fasting can reduce oxidative stress, which happens when there’s unevenness between free radicals and antioxidants in the body. Lower oxidative stress levels can improve blood pressure regulation.

Enhanced Heart Health

Several studies have demonstrated that fasting can have cardioprotective effects, including improved heart rate, blood pressure, and cardiovascular function. These benefits may be attributed to the abovementioned mechanisms.

Remember – it’s crucial to approach fasting cautiously; individual results may vary. Maintaining good health is essential. Paying attention to your body, staying knowledgeable, and making informed decisions that support your overall well-being is crucial.

Also, read – The Truth Behind Does Lemon Water Break

Why Does Fasting Lower Blood Pressure

Fasting reduces the number of stress hormones in your body, which can help prevent high blood pressure.

Fasting also increases the number of ketones produced by the liver. Ketones are another fuel source for the brain and other body organs. Ketones can lower blood sugar and help prevent type 2 diabetes.

Finally, fasting lowers blood pressure (bp) by reducing the amount of sodium in the body and stimulating the production of renin. This hormone increases the production of angiotensin-converting enzyme (ACE) production, which helps your kidneys excrete excess salt and water.

Fasting also causes a temporary rise in cortisol (the stress hormone), which may lead to a temporary increase in blood pressure.

Fasting and Blood Pressure: Mechanisms That Contribute to Lowering Blood Pressure through Fasting

Fasting, or voluntarily refraining from eating for a particular time, is a practice that has been embraced for thousands of years for various reasons, including religious rituals, health enhancement, and weight management. 

However, fasting has recently received increasing attention from the medical community for its potential to impact cardiovascular health, particularly concerning lowering blood pressure.

The exact mechanisms by which fasting influences blood pressure aren’t entirely understood, but research has pointed to several potential contributors that will be discussed here. 

  • Firstly, fasting can contribute to weight loss, widely recognized as a critical strategy for lowering blood pressure. Obesity and high blood pressure often go hand in hand, so the weight loss associated with fasting can significantly improve blood pressure. This is because as weight decreases, the strain on the heart to pump blood decreases, leading to a reduction in blood pressure.
  • Secondly, fasting has been found to affect insulin sensitivity positively. Insulin resistance, a condition where the body’s cells become less responsive to insulin, is a principal risk factor for high blood pressure. Fasting demonstrates increasing insulin sensitivity, thus reducing the risk of developing high blood pressure.
  • Thirdly, fasting can reduce blood volume, which in turn can lower blood pressure. Fasting triggers a complex set of physiological responses in the body, one of which is decreased blood volume due to reduced food and fluid intake. Lower blood volume can lead to a corresponding drop in blood pressure.
  • Moreover, fasting has been linked to reductions in systemic inflammation, a condition associated with high blood pressure. Inflammatory markers such as C-reactive protein have decreased during fasting periods, suggesting a link between fasting and reduced inflammation. This may have positive effects on blood pressure.
  • Lastly, fasting may influence blood pressure through its effects on the nervous system. Fasting has been linked to alterations in the autonomic nervous system, which regulates heart speed and blood pressure. Changes in autonomic function during fasting could contribute to lowering blood pressure.

Intermittent Fasting and Blood Pressure

If you’re looking for methods to help lower your blood pressure, intermittent fasting may be the way to go.

The research is still new and inconclusive, but there’s good evidence that intermittent fasting can help control blood pressure.

This may sound strange initially, but it’s pretty standard in many cultures worldwide and has been used for centuries to help manage weight loss, energy levels, and other health problems.

A study published in The American Journal of Clinical Nutrition in 2010 found that after six months, those who ate an intermittent fasting diet had lower blood pressure than those who didn’t. But the study also found that the people on the intermittent fasting diet had higher cortisol levels — a stress hormone.

“The health effects of intermittent fasting are mixed,” says Dr. Aviva Romm, a cardiologist from Harvard Medical School in Boston, Massachusetts. “Some studies have shown it beneficial, but others have not.”

Also, read – How Long Does it Take to Enter Into Ketosis

How to Reduce Blood Pressure

Health experts recommend keeping your blood pressure under 140/90 mm Hg to help prevent a high heart rate after breaking fast and its related health problems, such as heart attack, stroke, and other cardiovascular issues. So if you have high blood pressure or are concerned about it — it’s crucial to get it under control before it becomes a problem.

There are several ways to lower your blood pressure without taking any medication, including:

Weight loss: Being obese is one of the ways to increase your risk for high blood pressure because obesity strains your heart and arteries. You can lose weight by cutting back on unhealthy foods from your diet, getting more exercise, and increasing the amount of time you spend exercising each week.

Eating healthy foods: Cutting back on salt, fried foods, and sugary drinks can help lower your blood pressure naturally without medication. Aim for 500 milligrams of sodium (1 teaspoon) per day or less if possible; if this isn’t possible, try to limit yourself to 1,500 mg per day or less. Eating more fruits.

Fasting: Fasting is a great way to lower blood pressure. When you fast, your body will naturally increase nitric oxide production, which dilates blood vessels and lowers blood pressure.

Losing weight may also help lower your blood pressure if you are overweight. Losing weight takes much less stress on the heart because less mass is pressing down on it.

The idea behind fasting is that when you don’t eat, your body uses more energy than usual to keep itself alive. This means that when you start eating again, your blood volume increases, and your blood pressure goes up because of the work being done by the heart to pump blood around the body. But after a while, when you’ve adapted to not eating for a time, your body starts using less energy, so there’s less work being done by the heart and less pressure on the blood vessels.

Fasting also lowers your levels of stress hormones such as cortisol and adrenaline, which are linked with increased blood pressure.

Does Fasting Clear Arteries – Common Mistakes to Avoid 

The question of whether fasting can clear arteries is a growing interest, given the increasing prevalence of cardiovascular diseases worldwide. While the notion of fasting to clear arteries may sound appealing, it’s essential to approach this subject with evidence-based information and avoid misconceptions that could potentially harm health.

Fasting, especially in a supervised and structured manner, has indeed shown beneficial impacts on specific aspects of cardiovascular health. 

However, it’s crucial to clarify that no dietary strategy, including fasting, can “clear” or “unclog” hardened arteries directly, as this condition is a product of years of accumulated plaque – a process known as atherosclerosis.

Fasting can improve several markers of cardiovascular health, which may indirectly contribute to slowing the progression of atherosclerosis. For instance, fasting has been linked to improvements in weight management, insulin sensitivity, and blood lipid profiles. 

It can also help to decrease systemic inflammation, a known contributor to cardiovascular diseases.

However, these benefits do not equate to a direct “clearing” of arteries. Even more, approaching fasting with such a simplistic view could lead to common mistakes and potential health risks. 

Overlooking a balanced diet 

Relying solely on fasting without paying attention to what you consume during eating could lead to nutrient deficiencies and other health issues.

Ignoring physical activity

Regular exercise is vital for cardiovascular health. Fasting cannot replace the benefits derived from physical activity, which directly contributes to improved cardiovascular function and can help slow the progression of atherosclerosis.

Neglecting medical advice 

People with individual medical conditions or pregnant or breastfeeding should not embark on a fasting regimen without professional medical guidance.

Extreme fasting

Very long or extreme periods of fasting can lead to malnutrition, electrolyte imbalances, and other health issues. It’s essential to adopt a fasting schedule that’s appropriate for your health status and lifestyle.

NOTE: while fasting can confer some cardiovascular benefits, it shouldn’t be viewed as a miracle cure or a direct means to “clear arteries.” 

Does Fasting Lower Cholesterol & How to Plan an Effective Fasting Routine 

The effects of fasting on cholesterol levels have been a subject of scientific interest in recent years. Some research suggests that fasting, particularly intermittent fasting, can impact various health markers, including cholesterol levels.

Intermittent fasting has been shown in some studies as a helper in reducing low-density lipoprotein (LDL) levels, often called “bad cholesterol,” which can accumulate in the arteries and expand the risk of heart disease. 

One study conducted by Varady et al. (2015) found that participants following an alternate-day fasting routine for 8 weeks experienced a reduction in LDL cholesterol levels.

Moreover, it’s worth noting that fasting also appears to reduce levels of triglycerides – a type of fat found in the blood – while sometimes increasing high-density lipoprotein (HDL) cholesterol, the “good cholesterol.” An increase in HDL cholesterol is beneficial as it can help vacate other forms of cholesterol from the bloodstream.

So, does fasting lower cholesterol? It’s possible. But how to plan an effective routine while fasting?

1. Define Your Objectives: Understanding your goals for fasting is crucial. Are you looking to lose weight, improve mental clarity, increase autophagy, or enhance your metabolic health? Your goals will inform the type of fasting you choose.

2. Know Different Types of Fasting: There are several types of fasting, including intermittent fasting (16/8, 18/6, 20/4), alternate-day fasting, and the 5:2 diet. Each has its unique characteristics and health benefits.

3. Start Slow: If you are fresh to fasting, start slow. Begin with shorter fasting windows (e.g., 12 hours) and gradually increase as your body gets used to the fasting rhythm.

4. Choose Your Fasting Window Wisely: Align your fasting windows with your lifestyle. If you aren’t a morning person, it might be easier to skip breakfast. If social dinners are a big part of your life, skipping dinner might be harder.

5. Prepare Healthy Meals: During eating windows, focus on nutrient-dense foods – plenty of vegetables, lean proteins, healthy fats, and whole grains. Avoid processed foods and sugars – they can spike your blood sugar levels and create energy crashes.

6. Mindful Eating: Practice mindful eating during your feeding window. This helps ensure you eat for nutrition and not just to satisfy hunger.

7. Monitor Your Progress: Keep track of your weight, energy levels, mood, and other health indicators. If your health is declining, reassess your fasting routine.

8. Get Plenty of Sleep: Good sleep is essential for a successful fasting regimen. Lack of sleep increases hunger and cravings, making fasting more challenging.

9. Break Your Fast Gently: Break your fast with a small meal or snack before going into a larger meal. Breaking a fast with a large meal can cause digestive issues.


Finally, does fasting help lower blood pressure? The good news is that it won’t have any harmful side effects. In addition, it appears your blood pressure can go down; this is a sign of improved cardiovascular health (at least over the short term).

The evidence is clear: fasting is an effective, safe method for patients to maintain healthy blood pressure levels.

William is from Canada, he is passionate nutrition & wellness writer. William understands that the topic of wellness is still not well understood, so his goal is to enlighten and teach people how to live healthier and happier in their bodies.

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