Artificial Sweeteners: Healthy Fast Track to Obesity?

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The variety of sugar substitutes on the market to satisfy the sweet tooth of the population while reducing calorie content can often be confusing. To add to the confusion, experts have found that “diet” varieties of foods and beverages may, in fact, increase appetite.

Artificial sweeteners are increasingly used as a substitute for sugar as they achieve the same level of sweetness in a product while contributing little to no calories.

There are currently six high-intensity sweeteners that are approved by the United States Food and Drug Administration (FDA) as food additives including saccharin, aspartame, acesulfame potassium (Ace-K), sucralose, neotame, and advantame.

While these sweeteners are widely used in foods and beverages marketed as “sugar-free” or “diet,” a new study published in the journal Cell Metabolism reveals how artificial sweeteners affect the brain and the effect it has on regulating appetite and altering taste perceptions.

The study, co-led by the University of Sydney, discovered that there is an area of the brain that senses and integrates the sweetness and energy content of food.

When exposed to a diet laced with high quantities of the artificial sweetener, sucralose, the researchers found that animals consumed more food, which suggests that artificial sweeteners can make you feel hungrier and, as a result, eat significantly more. Sucralose is derived from sucrose and is up to 650 times sweeter than sugar.

Through systematic investigation of this effect, we found that inside the brain’s reward centers, sweet sensation is integrated with energy content. When sweetness versus energy is out of balance for a period of time, the brain recalibrates and increases total calories consumed – Associate Professor Greg Neely, Faculty of Science, University of Sydney.

Sweeteners stimulate appetite through complex neuronal network

The researchers identified that artificial sweeteners stimulate appetite by triggering a complex neuronal network that responds by alerting the diner that not enough energy has been consumed.

Using this response to artificially sweetened diets, we were able to functionally map a new neuronal network that balances food’s palatability with energy content. The pathway we discovered is part of a conserved starvation response that actually makes nutritious food taste better when you are starving – Associate Professor Greg Neely, Faculty of Science, University of Sydney.

Also revealed in the study was that hyperactivity, decreased sleep quality and insomnia was elevated with consumption of artificial sweeteners. These behaviors are often displayed in those fasting or in a mild state of starvation and have been linked with artificial sweeteners in other human studies.

With artificial sweeteners recommended as an aid to control weight without substantial evidence on how they impact the brain or regulate hunger, the new findings highlight that artificial sweeteners may add to the risk of obesity rather than assisting in reducing the risk through weight control.