Natural Versus Refined Sugar

Sugar is a simple carbohydrate that the body converts into glucose to use for energy. 

Natural sugars are found in foods, including fruits (fructose) and dairy (lactose), and provide essential nutrients to our body. However, refined sugar comes from sugarcane, which is processed for extraction (i.e. sucrose, a combination of glucose and fructose). The majority of the processed foods we consume include refined sugar, which contains little to no nutritional value. Refined sugar is often found in store-bought foods, including cookies, cakes, salad dressings and frozen dinners. Refined sugar doesn’t provide our body with any real nourishment in terms of vitamins, minerals, fiber, phytonutrients, and antioxidants. 

When consumed in excess, processed forms of sugar can contribute to weight gain over time due to the added calorie consumption. The WHO has indicated that no more than 10% of an adult’s calories—and ideally less than 5%—should come from added sugar or natural sugars in honey or maple syrup [3]. For a 2,000-calorie diet, 5% would be 25 grams of sugar per day. 

What causes sugar cravings?

The brain’s primary source of fuel is glucose. Sugar consumption causes the release of endorphins, which activate the reward centers of the brain and the release of the ‘feel-good’ and habit-forming hormone, dopamine. As we consume more sugar, our bodies create more dopamine receptors, which creates a cycle of continued sugar cravings and excess sugar consumption. 

Furthermore, the body breaks down high-glycemic refined sugar, which rapidly causes insulin and blood sugar levels to peak. The problem is that refined sugar contains no subsistence and is digested very quickly, which throws blood sugars off balance. On the other hand, natural sugars contain dietary fiber, which slows digestion and contributes to feelings of satiety. High-glycemic foods like breakfast cereals and white bread activate these reward-response regions of the brain, creating more intense cravings as compared to low-glycemic foods like whole grains and starchy vegetables.

Cutting out refined sugar

Excess sugar consumption over time has shown to contribute to a host of negative health effects, including chronic illness such as type 2 diabetes and cardiovascular disease. Type 2 diabetes results when sugar production outweighs our body’s ability to effectively produce insulin for blood sugar regulation, causing ‘insulin resistance’ and a build-up of glucose in the blood. Sugar is also known to contribute to widespread inflammation within the body by lowering the efficiency of white blood cells and hindering our ability to fight disease and infection. Cutting out refined sugar starts with a transition from processed foods to less sweetened, unrefined, whole foods. Our team at F45 has put together some tips on how best to cut refined sugar

Tips to cut refined sugar: 

Rule of thumb: Choose a diet based on whole foods rather than highly processed alternatives to be fully in control of your sugar intake!


Lennerz, B. S., Alsop, D. C., Holsen, L. M., Stern, E., Rojas, R., Ebbeling, C. B., … & Ludwig, D. S. (2013). Effects of dietary glycemic index on brain regions related to reward and craving in men. The American journal of clinical nutrition, 98(3), 641-647.

(2016, March). 2015-2020 Dietary Guidelines for Americans Cut Down on Added Sugars. Retrieved from

Guideline: Sugars intake for adults and children. Geneva: World Health Organization; 2015. Retrieved from

Ervin, R.B., Kit, B.K., Carroll, M.D., & Ogden, C.L. U.S. Department of Health and Human Services, Centers for Disease Control and Prevention. (2012). NCHS Data Brief No. 87: Consumption of added sugar among U.S. children and adolescents, 2005–2008. . Retrieved from