Can Intermittent Fasting Double Your Risk of Dying from a Heart Attack?

by DailyHealthPost Editorial

A study making headlines recently has caused quite a stir, suggesting that intermittent fasting could be linked to a whopping 91% increased risk of cardiovascular disease. Before we jump to conclusions, let’s break down what this observational study actually says.

It analyzed survey data from more than 20,000 adults over a long period and compared the health outcomes of those who practiced time-restricted eating to those who did not. While the findings may raise eyebrows, it’s critical to note that the study does not establish a cause-and-effect relationship. It simply points to an association between intermittent fasting and heart health risks.

Critical Analysis of the Data

So, what does this mean for you? Well, it’s important to critically analyze any study before changing your lifestyle based on its findings. This particular study has its limitations. For instance, it relies on self-reported data, which can be unreliable. People might not remember exactly what they ate or when they ate it. The study also doesn’t account for the quality of the diet during the eating periods or other lifestyle factors that could influence heart health.


Most importantly, the study’s results are preliminary and have not yet been peer-reviewed. That’s an essential step in the scientific process, as it ensures that other experts have examined the research and agree with the conclusions drawn. Until then, we should be cautious about making any drastic changes to our diets based on this study alone.

In short, there’s a lot more to consider than the headline-grabbing percentage. For more insights on this topic, read the analysis by experts on the matter here and here.

Quick Facts on Intermittent Fasting and Heart Health

What Is Intermittent Fasting?

Intermittent fasting isn’t just a diet; it’s a pattern of eating. It’s about cycling periods of eating with periods of not eating. This could mean eating all your meals within an eight-hour window and fasting for the remaining 16 hours of the day. It’s not about which foods to eat, but rather when you should eat them. The idea is that this timing can trigger certain biological processes that may benefit your health.

How Might Fasting Affect the Heart?

When you fast, your body undergoes several changes. Blood levels of insulin drop, which facilitates fat burning. The body also initiates important cellular repair processes and changes hormone levels to make stored body fat more accessible. These changes are thought to potentially benefit heart health by improving blood pressure, cholesterol levels, and blood sugar control. However, the heart is a complex organ, and how it’s affected by fasting can vary greatly from one person to another.

Understanding Your Heart Risk

Risk Factors for Heart Disease

When it comes to your heart, several risk factors can increase the likelihood of developing heart disease. These include high blood pressure, high abnormal cholesterol, obesity, physical inactivity, and smoking. Besides that, factors like a family history of heart disease, age, and pre-existing conditions like diabetes also play a role. It’s essential to know where you stand with these risks before considering intermittent fasting or any significant change in your eating patterns.

Does Fasting Increase These Risks?

The big question is whether fasting can increase these risks. The short answer is: it depends. For some, intermittent fasting may help manage weight, reduce inflammation, and improve metabolic health—all of which are beneficial for heart health. But, if fasting leads to extreme eating patterns, nutrient deficiencies, or stress, it could potentially worsen heart health. Therefore, it’s critical to approach fasting with a balanced perspective and personalized advice from a healthcare provider. If you plan to start intermittent fasting, take these tips into consideration:


Intermittent Fasting Methods

Popular Fasting Schedules

There are several intermittent fasting methods, each with its own rules. The 16/8 method involves fasting for 16 hours and eating within an 8-hour window. The 5:2 method entails eating normally for five days and restricting calories to 500-600 for two non-consecutive days. And then there’s the ‘Eat-Stop-Eat’ method, which involves a 24-hour fast once or twice a week. Each method has its advocates and can be effective, but the key is finding one that fits your lifestyle and doesn’t cause undue stress.

Choosing the Right Method for You

Choosing the right fasting method is a personal decision and one that should be made with consideration of your lifestyle, health goals, and any existing health conditions. If you’re someone who enjoys routine and can stick to a strict eating schedule, the 16/8 method might be a good fit. If you prefer more flexibility, the 5:2 approach could work better. It’s about what feels sustainable for you, because the best diet is the one you can stick to long-term.

Fasting Method




Fasting for 16 hours, eating during an 8-hour window

Requires daily commitment, may be easier to incorporate into a routine


Normal eating five days a week, calorie restriction for two days

Requires calorie counting, offers more flexibility


24-hour fast once or twice a week

May be challenging, requires significant willpower and planning

How to Fast Safely

Starting with a Plan

Before you begin intermittent fasting, it’s important to have a plan. Start by defining your goals and understanding your health status. If you have any chronic conditions or take medications, discuss fasting with your doctor. Next, choose a fasting method that aligns with your goals and lifestyle. Plan your meals to ensure you’re getting all the necessary nutrients within your eating window. And remember, hydration is key, so keep water on hand during fasting periods. For more guidance on meal planning and ensuring a balanced diet, consider reading about the best time to eat nuts for weight loss, which can be a healthy addition to your eating window.

When to Break the Fast

Listen to your body. If you feel unwell, lightheaded, or overly fatigued, it’s time to break the fast. Intermittent fasting should enhance your well-being, not detract from it. Eating nutrient-dense foods to break your fast can help replenish your body and maintain balanced energy levels. Include a mix of protein, healthy fats, and carbohydrates to support your body’s needs. And if fasting ever feels too challenging, it’s okay to adjust your approach or seek guidance from a nutrition professional.

What Is the Best Time to Start and End Your Fast?

Deciding when to start and end your fast is a personal choice that should align with your daily routine and energy needs. Many people find success with beginning their fast after dinner, around 8 PM, and breaking it around noon the next day. This schedule fits well with sleep patterns and can be easier to manage. However, the best timing is the one that you can consistently maintain and that causes the least disruption to your lifestyle and well-being.

Can You Exercise While Fasting?

Yes, you can exercise while fasting, but the intensity and type of exercise should be considered. Light to moderate activities like walking or yoga can be done while fasting. However, if you’re planning a high-intensity workout or strength training, it might be best to schedule it during your eating window when you have more energy and can refuel afterward. Always listen to your body and adjust your exercise routine as needed during fasting periods.


It’s also important to stay hydrated and be aware that your performance may not be at its peak when you’re fasting. If you feel weak or dizzy, it’s a sign to stop and consider breaking your fast.

Remember, the goal is to enhance your health, not push it to the brink. If you’re unsure about exercising while fasting, start slow and see how your body responds.

How Long Before You See Benefits from Intermittent Fasting?

The time it takes to see benefits from intermittent fasting can vary. Some people report feeling more energetic and focused within the first week, while others may take a few weeks to notice changes. Weight loss, improved metabolic health, and better blood sugar control are benefits that often require consistency over several weeks or months. It’s important to set realistic expectations and understand that benefits can be gradual and vary from person to person.

What Are the Signs That Fasting Isn’t Right for You?

Intermittent fasting isn’t for everyone, and there are signs to watch out for that suggest it may not be right for you. If you experience severe hunger, irritability, or fatigue that interferes with your daily life, it may be time to reassess. Other signs include poor sleep, anxiety about eating times, or if you have a history of disordered eating. It’s essential to prioritize your mental and physical health over any diet trend.

If you have any medical conditions, particularly those related to blood sugar regulation, it’s crucial to consult with a healthcare professional before starting intermittent fasting. They can provide guidance based on your individual health needs.

Do You Need to Fast Every Day to See Benefits?

No, you don’t necessarily need to fast every day to see benefits. Some intermittent fasting methods, like the 5:2 diet, involve fasting only a couple of days a week. The key is consistency with the method you choose and ensuring that it fits into your lifestyle in a sustainable and healthy way. It’s about creating a pattern that works for you and can be maintained over the long term for lasting health benefits.


Moreover, the quality of your diet during non-fasting periods is just as important as the fasting itself. Eating a balanced diet rich in whole foods will support your health goals and contribute to the benefits of intermittent fasting.