• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
Heather Cooan logo
  • My Story
  • Recipes
  • Articles
  • Resources
  • Services
  • Success Stories
  • Nav Social Menu

    • Facebook
    • Instagram
    • Pinterest
    • Twitter
    • YouTube
menu icon
go to homepage
  • My Story
  • Recipes
  • Articles
  • Resources
  • Services
  • Success Stories
    • Amazon
    • Facebook
    • Instagram
    • Pinterest
    • TikTok
    • YouTube
  • subscribe
    search icon
    Homepage link
    • My Story
    • Recipes
    • Articles
    • Resources
    • Services
    • Success Stories
    • Amazon
    • Facebook
    • Instagram
    • Pinterest
    • TikTok
    • YouTube
  • ×

    Home » Articles » Nutritional Therapies

    The Effects of Sugar on The Immune System

    Published: Apr 18, 2020 · Modified: Nov 21, 2022 by Heather Cooan, MBA, NTP, FDN-P, ONC · This post may contain affiliate links.

    Image by Myriam Zilles from Pixabay

    While a spoonful of sugar may help the medicine go down, the real medicine for our bodies seems to be forgoing that spoonful of sugar (and most other spoonfuls) altogether. We're going to look at the effects of sugar on the immune system in this article.

    In nutritional terms, our food is composed of three things: carbohydrates, proteins and fats. Carbohydrates, including fiber, starches and sugars, provide cellular energy when metabolized and fiber is essential for a healthy digestive system.

    However, the Standard American Diet (SAD) contains excessive amounts of sugar, and this excess glucose is stored in the liver, muscles and other cells, or is converted to fat. This, in turn, has been shown to have a number of negative effects on the immune system and our bodies in general.

    Let’s take a look at how sugar has the potential to disrupt the immune system. 

    The Spoonfuls Add Up

    Before we dive into the science, let’s consider sugar consumption on the whole. Fruits and vegetables contain natural sugars, starch and fiber, and when included in a balanced diet, make up all the carbohydrates your body requires, and possibly even more than what is needed for natural metabolic processes. Foods containing added sugars will almost always result in consuming excess sugar to what the body needs. Refined grains, like bread and pasta, soft drinks, candy and even added table sugar makes it easy to consume more sugar than the body requires. 

    The Harvard School of Public Health highlights that it’s important to keep in mind that on nutrition labels, 4 grams of sugar is equal to 1 teaspoon of sugar! And, it’s estimated that Americans consume 22 teaspoons of added sugar every day. (1)

    Sugar and the Immune System

    Even as far back as the early 1970s, a study determined that sugar had negative effects on the immune system. The study wanted to see how sugars impacted the ability of the human immune system to attack and consume pathogens, such as bacteria and viruses. Testing a wide variety of simple sugars, researchers determined that all tested sugars significantly reduced the ability of human neutrophils, a type of white blood cell, to engulf pathogens, and this decreased capacity remained for up to five hours after the sugar was consumed. (2)

    As research is expanding with respect to the complexity of the immune system and how nutrition affects it, even more is being uncovered about the harmful effects of sugar.

    Systemic Inflammation

    According to a 2018 meta-analysis of previous sugar studies, dietary sugar intake (particularly from sugar-sweetened soft drinks and beverages), may stimulate subclinical widespread inflammation in the body. It has been shown that C-reactive protein (CRP), an inflammatory marker, is higher in those who consume higher amounts of dietary sugar and soft drinks. (6)

    I've detailed how sugar drives inflammation in this post and how to manage inflammation through diet in this post.

    What is it that causes this increase in inflammation? The immune system is a very complex system of cells, and while the mechanisms behind what causes inflammation are not exactly clear, one theory stems from lipotoxicity. Eating (or drinking) too much dietary sugar promotes the formation of free fatty acids (FFA) in the liver, and the metabolites from FFA, trigger an inflammatory response in the immune system that leads to an attack on healthy cells in various body systems. This systemic inflammation may be responsible for many chronic illnesses, including autoimmune conditions, cardiovascular disease, diabetes, dementia and neurodegenerative disease, depression, and mental health issues. (6)

    Image by Tania Dimas from Pixabay

    Obesity and Immune Dysfunction

    Not all of the effects of sugar on the immune system are direct. While excess sugar seems to cause low-level inflammation even in individuals who are at a healthy weight, changes in eating habits have led to record levels of obesity in both the American and global populations, which has created a number of particular health challenges, including an increase in the incidence of insulin resistance, type 2 diabetes, and cardiovascular diseases. 

    To think of the problem in another way, let’s consider that obesity is due to an excess of energy storage caused by eating energy-dense, nutrient-poor foods, including excessive amounts of sugar and other high-sugar processed foods and beverages. 

    This excess of sugar, or energy, cannot be used because it is not required by the body. Energy that cannot be expended by the body, must be stored in body cells or stored as fat. This overabundance of glucose contributes to a number of problems seen in obesity-related metabolic disorders, including substantial alterations in immune responsiveness. Obesity leads to an imbalance of the cytokine network which produces a low-grade systemic inflammatory response and an elevation of inflammatory cytokines throughout the body. (4)

    In addition to cytokine disruption, obesity has been linked to:

    • Macrophage accumulation in fat tissue, leading to both phagocytic impairment and associated inflammation (5)
    • An increased susceptibility to systemic infections and infectious complications after surgery
    • Higher incidence of skin and respiratory tract infections (6)

    In short, inflammation and immune cell impairment seen in obese individuals are significantly due to the overconsumption of sugar and the body’s inability to use that excess energy.

    Gut Dysbiosis

    Along with systemic inflammation and the unique challenges of obesity, sugar also plays a role in creating gut dysbiosis which has a significant impact on the immune system. Diets high in fat and sugar have been shown to lead to changes in the microbiota of the gut. Changes and imbalances in the microbial community of the gut leads to intestinal permeability, which allows food particles that have not been fully digested to enter the bloodstream. This is turn can cause everything from inflammation, insulin resistance, glucose intolerance and metabolic diseases. Also known as leaky gut syndrome, it has been shown to play a role in increased levels of inflammatory biomarkers and cytokines, including tumor necrosis factor. (7)

    Read more about Digestive Dysfunction: The Long-Term Impact

    Finding the Sweet Spot of Health

    Looking at sugar with respect to the immune system, you may have picked up on just how much everything is interconnected. Consuming sugar in excess to what your body needs is very easy to do, particularly with sugary beverages, and convenience, processed and fast foods. This excessive sugar causes a cascading effect that leads to poor health by upsetting the natural balance of the immune system. Systemic inflammation, obesity and gut dysbiosis are all linked in numerous ways, and dietary sugar plays an important, yet sinister, role in all of it. (8)

    While many of us have a complicated relationship with food, whether it’s due to societal or personal pressures, our emotions, or any number of other factors, the most important thing to focus on is that we all have the power to change. Boiling it down to the science of nutrition and looking at how your body actually fuels itself can offer a new perspective on what your body really needs. Instead of thinking about restricting sugar, focus on adding in more healthful options. These additions can help you to slowly phase out those less healthy options, and any steps to reduce sugar in your diet are bound to pay off in the long run!

    You may be interested in The Role of Vitamin D in Autoimmune Disease

    References:

    1. Harvard T.H. Chan School of Public Health. The Nutrition Source: Added Sugar in the Diet [Internet]. [cited 10th January 2020]. Available from: https://www.hsph.harvard.edu/nutritionsource/carbohydrates/added-sugar-in-the-diet/

    2. Sanchez A, Reeser J, Lau H, Yahiku P, Willard R, McMillan P, et al. Role of sugars in human neutrophilic phagocytosis. Am J Clin Nutr. 1973;26:1180-4. 

    3. Della Corte K, Perrar I, Penczynski K, Schwingshackl L, Herder C, Buyken A. Effect of Dietary Sugar Intake on Biomarkers of Subclinical Inflammation: A Systematic Review and Meta-Analysis of Intervention Studies. Nutrients. 2018;10:606. 

    4. Aronson D, Bartha P, Zinder O, Kerner A, Markiewicz W, Avizohar O, et al. Obesity is the major determinant of elevated C-reactive protein in subjects with the metabolic syndrome. Int J Obes. 2004;28:674–9.

    5. Neels J, Olefsky J. Inflamed fat: what starts the fire? J Clin Invest. 2006;116:33-5.

    6. Wolowczuk I, Verwaerde C, Viltart O, Delanoye A, Delacre M, Pot B, et al. Feeding our immune system: impact on metabolism. Clin Dev Immunol. 2008:639803.

    7. Do M, Lee E, Oh M, Kim Y, Park HY. High-Glucose or -Fructose Diet Cause Changes of the Gut Microbiota and Metabolic Disorders in Mice without Body Weight Change. Nutrients. 2018;10:761.

    8. Brown K, DeCoffe D, Molcan E, Gibson DL. Diet-induced dysbiosis of the intestinal microbiota and the effects on immunity and disease. Nutrients. 2012;4:1095-119.

    Nutritional Therapies

    • Variety of beans, grains, and fruit on a table.
      Food Sensitivity, Intolerance, or Allergy?
    • Knife and fork with black handle sitting on a wooden cutting board surrounded by cheese, garlic, avocado, steak, salmon, tomatoes, green beans, and spices.
      The Six Stages of Ketosis
    • Grilled T-bone steak topped with pomegranate seeds plated on a black plate with grilled fennel, a slice of brei cheese, and a side salad with fork and knife.
      Nutritional vs. Therapeutic Ketosis
    • sliced sourdough bread loaf
      Sourdough Health Benefits
    80 shares
    • 78

    Reader Interactions

    Tell Me What You Think

    Your email address will not be published. Required fields are marked *

    Recipe Rating




    This site uses Akismet to reduce spam. Learn how your comment data is processed.

    Primary Sidebar

    Heather Cooan - Nutrition Consulting, Counseling, and Education

    Hi, I'm Heather! I’m a Functional Nutritionist and Educator helping women suffering from autoimmunity and cancer take control of their health and care through education, data-driven nutritional therapy, and strategic lifestyle design.

    More about me →

    WARM WINTER RECIPES

    • Homemade chicken soup in the crockpot
      Homemade Chicken Soup (GFDF, Keto, Paleo, AIP, Whole30)
    • Shiitake Noodle Pho
      Shirataki Noodle Pho (Keto, Paleo, GFDF, Whole30, Low-Iron)
    • Venison chili in the crockpot.
      End of The World Venison Chili (Keto, Whole30, Paleo, GFDF)
    • Turkey Stew
      Turkey Stew (GFDF, Keto, Paleo, AIP, Whole30, Low Iron)

    POPULAR RECIPES

    • One dozen keto pumpkin spice muffins stacked on a green plate.
      Keto Pumpkin Spice Muffins
    • Gluten-Free Sourdough Chocolate Chunk Cookies
    • pickle wheels - pickle, cream cheese, ham
      Pickle Wheels (Keto, GF, Low Iron)
    • Vanilla cupcakes on white wood background
      Vanilla Frosted Buttercream Cupcakes (GFDF, Keto, Low-Iron)
    • Cheesecake with Raspberry Sauce
      Cheesecake with Raspberry Sauce (Keto, GF, Vegetarian, Low-Iron)
    • Roast Duck (Keto, Paleo, GFDF, AIP, Whole30)

    LATEST POSTS

    • Variety of beans, grains, and fruit on a table.
      Food Sensitivity, Intolerance, or Allergy?
    • Side profile of a digital man breathing in green pollen particles on a blue and white background.
      Histamine Intolerance an Overview
    • Knife and fork with black handle sitting on a wooden cutting board surrounded by cheese, garlic, avocado, steak, salmon, tomatoes, green beans, and spices.
      The Six Stages of Ketosis
    • female compounding pharmacist holding mortar and pestle with male pharmacist in the background
      Low-Dose Naltrexone for Cancer and Autoimmune Disease

    Footer

    ↑ back to top

    About

    • Privacy Policy
    • Disclaimer
    • Terms of Use
    • Affiliate Disclosure
    • Accessibility Policy

    Let's Connect!

    • Facebook
    • Instagram
    • YouTube
    • Pinterest
    • Twitter

    Subscribe for Recipes and Updates

    My Amazon Favorites

    Work With Me

    • Functional Nutrition Services
    • Contact Us
    • Media and Press

    Disclaimer All information on this website and in HDC Media products, services, meal plans, and content is general information. Nothing on the website or any HDC Media content is intended to be a substitute for professional medical advice, diagnosis, or treatment.

    Affiliate Disclosure Many outgoing links on HeatherCooan.com are affiliate links. If you purchase a product after clicking an affiliate link, I receive a small percentage of the sale for referring you, at no extra cost to you. HDC Media is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.

    Copyright © 2022 Functional Nutrition Consultant - Heather Cooan

    We are using cookies to give you the best experience on our website.

    You can find out more about which cookies we are using or switch them off in settings.

    Heather Cooan
    Powered by  GDPR Cookie Compliance
    Privacy Overview

    This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.

    Strictly Necessary Cookies

    Strictly Necessary Cookie should be enabled at all times so that we can save your preferences for cookie settings.

    If you disable this cookie, we will not be able to save your preferences. This means that every time you visit this website you will need to enable or disable cookies again.