In a world full of sugary temptations, a little goes a long way when it comes to your heart health. From the hidden sugars in seemingly innocent snacks to the well-known culprits like sodas and candies, let’s navigate the complex relationship between sugar and heart disease.

Excess sugar consumption can contribute to obesity, insulin resistance, inflammation, and increased triglyceride levels, all of which are linked to heart disease. Let’s explore the association between cardiovascular disease and sugar, plus tips to reduce sugar intake.

Cardiovascular Disease and Sugar

Excessive consumption of added sugars found in ultra-processed foods and sugary beverages is linked to weight gain and obesity. High sugar intake often leads to an increase in overall caloric intake. This surplus of energy is stored as fat, contributing to obesity, a significant risk factor for heart disease.

Furthermore, studies suggest that diets high in added sugar can contribute to insulin resistance, a condition in which cells no longer respond effectively to insulin, the hormone responsible for regulating blood sugar levels. This can result in elevated blood sugar and insulin levels, which can lead to inflammation within your artery walls. 

Over time, this inflammation can damage the artery walls, making them more susceptible to plaque build-up. Furthermore, this plaque buildup can contribute to blood vessel stiffness, which can lead to increased blood pressure.

Natural vs. Artificial vs. Added Sugars

Sugars can be broadly categorized into natural, added, and artificial, each with distinct metabolic pathways and health implications:

• Natural sugars: Found in whole, unprocessed foods such as fruits, vegetables, and dairy. These sugars, such as fructose (found in fruit) and lactose (found in milk), are often found in foods that also contain nutrients like vitamins, minerals, and antioxidants, which can protect your heart from oxidative stress and inflammation. Fiber in produce can improve blood pressure, blood lipids, and body weight, and support healthy blood sugar regulation.
• Added sugars: Added sugars (or free sugars) are added to ultra-processed foods and beverages. These sugars include sucrose (table sugar), high fructose corn syrup, and various other syrups and sweeteners. Foods high in added sugars usually lack important nutrients, including fiber, and promote dramatic blood sugar spikes, which can damage blood vessels and increase your risk of heart disease.
• Artificial sweeteners: While these provide sweetness without calories, recent research suggests that sucralose and saccharin may disrupt the balance of your gut microbiome by decreasing beneficial bacteria. This imbalance can increase inflammation and decrease immune system function, increasing your risk for developing heart disease.

How Sugar Affects the Heart and Circulation

Can Sugar Raise Heart Rate?

Sugar can temporarily raise your heart rate. This is because when you eat foods high in sugar, your blood glucose levels spike, prompting your body to release insulin and stress hormones like adrenaline. Over time, high sugar intake can contribute to insulin resistance, inflammation, and changes in blood vessel function that increase the risk of heart rhythm irregularities and cardiovascular disease.

Does Sugar Raise Blood Pressure?

While salt is often blamed for high blood pressure, studies show that excess sugar intake can also have an effect. Research has found that excess sugar consumption can lead to insulin resistance, which can cause your kidneys to retain more sodium. Higher sodium can lead to increased fluid retention, raising blood volume and subsequently, blood pressure.

Does Sugar Cause Inflammation?

Eating excessive amounts of added sugar can trigger a series of inflammatory responses within your body. High sugar consumption has been linked to more pro-inflammatory cytokines, small proteins that play an important role in cell signaling during immune responses. This chronic low-grade inflammation is linked to various chronic diseases, including heart disease, diabetes, and obesity.

Excess sugar can also promote oxidative stress, an imbalance between free radicals and antioxidants in the body that can damage cells and DNA. When sugar metabolism produces excessive free radicals, it overwhelms the body’s natural defense mechanisms, leading to oxidative stress, damaging blood vessel walls, and allowing cholesterol and other substances to accumulate and form plaques. These plaques can restrict blood flow and, in some cases, rupture, leading to heart attacks or strokes.

Does Sugar Raise Cholesterol and Triglycerides?

Consuming a lot of added sugar can raise triglyceride levels, which contribute to the formation of arterial plaques and prothrombotic events. This can lead to atherosclerosis, a condition where the arteries narrow and harden, hindering blood flow and increasing the risk of heart attacks and strokes.

How Much Sugar is Too Much?

According to the American Heart Association (AHA), American adults consume approximately 17 teaspoons of added sugar each day. This is an astonishing 2 to 3 times more than the recommended daily amount.

The AHA advises that men should consume no more than 9 teaspoons (36 grams or 150 calories) of added sugar per day, and no more than 6 teaspoons (25 grams or 100 calories) per day for women. 

Furthermore, the DASH Diet recommends up to 5 servings of added sugar or sweets per week, which is about 2 teaspoons per day.

Note: Naturally occurring sugars in fruits, vegetables, and dairy are not included in this limit, as they come with essential nutrients and dietary fiber.

Practical Tips for Managing Added Sugar Intake

Reducing added sugar intake is a great step to take toward achieving better heart health. Here are some tips to consider. 

• Explore natural sweeteners. Replacing added sugar with natural alternatives like dates, applesauce, mashed bananas, or pumpkin in your favorite dessert, smoothie, or baked goods recipes can provide the desired sweetness without the drawbacks of processed sugars. Additionally, natural sweeteners can contribute important nutrients and antioxidants.
• Opt for less processed foods. Fruits, vegetables, and whole grains can help naturally reduce your intake of added sugar. Whole foods provide essential vitamins and minerals and are often rich in fiber, which can promote normal cholesterol levels and a healthy weight. Whole foods also tend to be rich in antioxidants, which can help reduce oxidative stress and inflammation.
• Consult a dietitian. Working with a registered dietitian who specializes in heart disease will allow you to create a customized meal plan featuring recipes tailored to your lifestyle and taste preferences, including reduced sugar intake.

FAQs About Sugar and Heart Health

Is sugar bad for your heart if you only eat it occasionally?

Occasional sugar isn’t likely to harm your heart, especially if you aim to follow the daily intake guidelines. The risk comes from frequent, high intake, which can raise blood pressure, triglycerides, and inflammation.

Does sugar raise triglycerides?

Sugar mainly raises triglycerides, but it can also lower HDL (“good” cholesterol) and contribute to an unhealthy cholesterol balance over time.

Can sugar raise heart rate right after eating?

Yes, sugar can cause temporary heart rate increases due to spikes in blood glucose and insulin release. 

Final Thoughts on Sugar and Your Heart

Having a deeper understanding of the impact of sugar on your heart health can help you make informed decisions about what you eat and drink. Consuming an excess of added sugar can contribute to risk factors like obesity, diabetes, inflammation, and high blood pressure, all of which are precursors to heart disease.

Balancing your diet with whole, unprocessed foods like fruits, vegetables, and whole grains and swapping out refined sugar for natural sweeteners, you can make substantial strides in reducing your sugar intake, paving the way for a heart-healthy future.

If you need support and guidance to optimize your heart health, I offer group programs and 1:1 counseling that address oxidative stress, insulin resistance, and inflammation, providing a comprehensive approach to the prevention and management of heart disease.

Sources

1. Parhofer KG. Interaction between Glucose and Lipid Metabolism: More than Diabetic Dyslipidemia. Diabetes Metab J. 2015;39(5):353-362. doi:10.4093/dmj.2015.39.5.353 https://pmc.ncbi.nlm.nih.gov/articles/PMC4641964/
2. American Heart Association. (2024). How Much Sugar Is Too Much? https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/sugar/how-much-sugar-is-too-much#:~:text=American%20adults%20consume%20an%20average,%2Dpound%20bowling%20balls%2C%20folks! 
3. Rippe JM, Angelopoulos TJ. Relationship between Added Sugars Consumption and Chronic Disease Risk Factors: Current Understanding. Nutrients. 2016;8(11):697. Published 2016 Nov 4. doi:10.3390/nu8110697 https://pmc.ncbi.nlm.nih.gov/articles/PMC5133084/
4. Volpe, C.M.O., Villar-Delfino, P.H., dos Anjos, P.M.F. et al. Cellular death, reactive oxygen species (ROS) and diabetic complications. Cell Death Dis 9, 119 (2018). https://doi.org/10.1038/s41419-017-0135-z
5. Ma X, Nan F, Liang H, et al. Excessive intake of sugar: An accomplice of inflammation. Front Immunol. 2022;13:988481. Published 2022 Aug 31. doi:10.3389/fimmu.2022.988481 https://pmc.ncbi.nlm.nih.gov/articles/PMC9471313/
6. Quesada O, et al. Associations of Insulin Resistance With Systolic and Diastolic Blood Pressure: A Study From the HCHS/SOL. Hypertension, 78(3). doi:10.1161/HYPERTENSIONAHA.120.16905 https://www.ahajournals.org/doi/10.1161/HYPERTENSIONAHA.120.16905
7. Dinicolantion J, Lucan S. The wrong white crystals: Not salt but sugar as the etiological in hypertension and cardiometabolic disease. Open Heart, 2014. https://www.researchgate.net/publication/269400331_The_wrong_white_crystals_Not_salt_but_sugar_as_aetiological_in_hypertension_and_cardiometabolic_disease 
8. DiNicolantonio JJ, O’Keefe JH. Added Sugars Drive Insulin Resistance, Hyperinsulinemia, Hypertension, Type 2 Diabetes and Coronary Heart Disease. Mo Med. 2022;119(6):519-523. https://pmc.ncbi.nlm.nih.gov/articles/PMC9762218/
9. Monnard CR, Grasser EK. Perspective: Cardiovascular Responses to Sugar-Sweetened Beverages in Humans: A Narrative Review with Potential Hemodynamic Mechanisms. Adv Nutr. 2018;9(2):70-77. doi:10.1093/advances/nmx023 https://pmc.ncbi.nlm.nih.gov/articles/PMC5916433/
10. Del Pozo S, Gómez-Martínez S, Díaz LE, Nova E, Urrialde R, Marcos A. Potential Effects of Sucralose and Saccharin on Gut Microbiota: A Review. Nutrients. 2022;14(8):1682. Published 2022 Apr 18. doi:10.3390/nu14081682 https://pmc.ncbi.nlm.nih.gov/articles/PMC9029443/
11. Reynolds, A.N., Akerman, A., Kumar, S. et al. Dietary fibre in hypertension and cardiovascular disease management: systematic review and meta-analyses. BMC Med 20, 139 (2022). https://doi.org/10.1186/s12916-022-02328-x
12. DiNicolantonio JJ, O’Keefe JH. Added Sugars Drive Insulin Resistance, Hyperinsulinemia, Hypertension, Type 2 Diabetes and Coronary Heart Disease. Mo Med. 2022;119(6):519-523. https://pmc.ncbi.nlm.nih.gov/articles/PMC9762218/
13. Faruque S, Tong J, Lacmanovic V, Agbonghae C, Minaya DM, Czaja K. The Dose Makes the Poison: Sugar and Obesity in the United States – a Review. Pol J Food Nutr Sci. 2019;69(3):219-233. doi:10.31883/pjfns/110735 https://pmc.ncbi.nlm.nih.gov/articles/PMC6959843/ 
14. University of Florida Health. DASH Diet to Lower High Blood Pressure. https://ufhealth.org/care-sheets/dash-diet-to-lower-high-blood-pressure