February 15, 2018 0 Comments

While it's not breaking news that too much sugar in your diet can lead to serious health concerns such as diabetes and obesity, there have been a lot of questions regarding sugars relationship to cancer.  We know that sugar consumption can impact our insulin levels which in turn can lead to chronic disease but... does too much sugar directly cause cancer?

While researchers are continuing to try to understand the direct connection between sugar and cancer, what we DO know is the power of a healthy, low sugar diet has tremendous health benefits.

So let's learn some important facts to understand how sugar can affect cancer cells!

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Sugar and Cancer: How Does Cancer Grow?

Our healthy cells are programmed by their DNA to follow our body's "rules" so-to-speak, meaning that they follow a healthy pattern of growth and replication as the body sees fit. A cancer cell is first created when a gene mutation happens to a healthy cell or a small group of cells.

Once a cell has mutated its original healthy programming or signals become faulty, leading the cell to start to grow and multiply too much and form a lump called a tumour.

As tumours grow and their cancer cells multiply, they need an increasingly larger blood supply.  In order to do this, they send out special signals to recruit the formation of new blood vessels (angiogenesis) to continue to help them grow. Once a cancerous mass can stimulate blood vessel growth, it can grow bigger and grow more quickly (1).

Cancer cells, just like our healthy cells, need oxygen and nutrients to grow and survive. Glucose is the sugar our bodies use most and is used as energy to feed every cell in the body, healthy or cancerous.  Having a glucose supply to feed our cells is so important that even without any carbohydrates in your diet, your body can make glucose from other sources like protein and fat.

Having a glucose supply to feed our cells is so important that even without any carbohydrates in your diet, your body can make glucose from other sources like protein and fat.


Sugar and Cancer: Does Sugar Actually Feed Cancer Cells?

Here's a great video explaining how sugar is metabolised in the body: 


We know that too much sugar isn't good for us, but does sugar directly feed cancer? The short answer is yes - but as we just learned, sugar feeds EVERY cell in our bodies! This is where things get a little confusing - there is an important difference between too much sugar in your diet creating an environment that may lead to more cancer growth and sugar directly feeding cancer cells leading them to growth.

Research has shown that it's actually sugar’s relationship to higher insulin levels and related growth factors that may influence cancer cell growth the most, and increase the risk of other chronic diseases (2). So you can think of this as too much sugar creating something of a more toxic environment which can promote cancer growth.

Many types of cancer cells have plenty of insulin receptors, making them respond more than normal cells to insulin’s ability to promote growth (3).

Furthermore, obesity, diabetes, and chronic overeating have had a positive correlation to the growth and development of cancer cells but not necessarily a direct causal link. According to the Canadian Cancer Society, being obese can cause changes in hormone levels – such as sex hormones or insulin – which increase the risk of developing breast, colon or uterine cancer. (4)

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How Much Sugar Per Day & What You Should Do:

Sugar has been related to a multitude of health problems, including diabetes, heart disease, stroke, immobility, elevated triglycerides and high blood pressure. A balanced lifestyle and cutting out refined sugars from soda and processed foods is a good start to decreasing your risk of cancer cell growth, as well as those other conditions.

1. Focus on a Balanced Diet

Consume your daily recommended amount of fruits and vegetables. Ensure you are getting enough fibre, iron, and protein in your diet. Do not drink fruit juices that have added sugar, and use natural sweeteners such as honey or stevia, and avoid high-fructose corn syrup and genetically modified sugar or sugar replacement such as aspartame.

Need a little help with new meal ideas? Look no further.

2. Eat the Right Amount of Sugar

for women, have no more than six teaspoons (25 grams) of sugar each day, for men, have no more than nine teaspoons per day (37 grams); this equals to 100 calories for women and 150 for men. The majority of people in America eat over double that amount, averaging at around 22 teaspoons per day. (5)

3. Watch for Hidden Sugars

fructose, lactose, sucrose, maltose, glucose and dextrose are all forms of sugar you can find on the Nutritional Facts label on the back of your next meal.

Other natural sugars: Molasses, agave nectar, honey and maple syrup are natural sugars and contain antioxidants that can protect your body from cancer. But consume these in moderation, as they contain the same amount of calories as any other kind of sweetener. (6)

4. Move More

Regular exercise decreases insulin resistance and helps you maintain a healthy body weight. Research suggests that lean, active people can consume a higher GI diet without increased cancer risk (3).

Remember that finding something you enjoy and can do consistently is the key here - you don't need to go start running marathons!


sugar and cancer, why is sugar bad for you, how much sugar per day, is sugar bad for you

PS if you're looking for more info on how to help balance your blood sugar levels and keep your sugar in check out my blog on reversing type II diabetes >>

RECOMMENDED READ: 5 Foods that Lower Blood Sugar


  1. http://www.cancerresearchuk.org/about-cancer/what-is-cancer/how-cancers-grow#bigger
  2. Barclay AW, Petocz P, McMillan-Price J, Flood VM, Prvan T, Mitchell P, Brand-Miller JC. Glycemic index, glycemic load, and chronic disease risk--a meta-analysis of observational studies. Am J Clin Nutr. 2008;87:627-37.Gnagnarella P, Gandini S, La Vecchia C, Maisonneuve P. Glycemic index, glycemic load, and cancer risk: a meta-analysis. Am J Clin Nutr. 2008;87:1793-801.
  3. https://www.oncologynutrition.org/erfc/healthy-nutrition-now/sugar-and-cancer/
  4. Onodera, Y., Nam, J., & Bissell, M. J. (2014, January 02). Increased sugar uptake promotes oncogenesis via EPAC/RAP1 and O-GlcNAc pathways. Journal of Clinical Investigation, 124(1), 367-384. doi:10.1172/jci63146
  5. Larsson, S. C., Bergkvist, L., & Wolk, A. (2006, June 12). Consumption of sugar and sugar-sweetened foods and the risk of pancreatic cancer in a prospective study. The American Journal of Clinical Nutrition, 84(5), 1171-1176.
  6. Sugar and cancer - Canadian Cancer Society. (n.d.). Retrieved October 24, 2016.
  7. Bristol, J., Emmett, P., Heaton, K., & Williamson, R. (1986, November 23). Sugar, fat, and the risk of colorectal cancer. Clin Res Ed, 291(1), 136-136. doi:10.1136/bmj.292.6513.136-c
  8. Espat, A. (2015, May 20). Does Cancer Love Sugar?
  9. Gill, C. (2014, July 5). Sugar Feed Cancer - Oncology nutrition. Retrieved October 24, 2016s

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