The long-standing perception that zero-sugar soft drinks are a healthier alternative to traditional sugary beverages is once again being questioned, following new scientific findings presented in Europe. Although marketed as calorie-free and widely consumed by those aiming to reduce energy intake, artificial sweeteners have become the focus of growing health concerns.

Emerging Research Raises Red Flags

At the United European Gastroenterology Week, organised by the European Society of Gastrointestinal Endoscopy, researchers presented data suggesting that regular consumption of drinks sweetened with artificial additives may increase the likelihood of developing non-alcoholic fatty liver disease by as much as 60%. According to the study, these beverages can trigger metabolic disturbances by inducing spikes in glucose and insulin, creating conditions that may impair liver function.

Several peer-reviewed papers have previously indicated similar findings. Research published in JAMA Internal Medicine, for instance, has linked high intake of artificially sweetened beverages to a greater risk of metabolic disorders, supporting the idea that these products are far from metabolically neutral.

Metabolic and Behavioural Impacts

The liver is not the only organ potentially affected. Nutrition specialists highlight that these beverages may also influence dietary behaviour, particularly due to their ability to maintain a preference for sweetness. This can lead to what experts call caloric compensation, whereby individuals subconsciously consume more calories from other foods.

As emphasised by Brazilian nutritionist Fabiana Rasteiro, from the Einstein Israelite Hospital, “the absence of sugar and calories does not automatically make a drink safe or beneficial”. She notes that soft drinks offer no vitamins, minerals or bioactive compounds, and their frequent consumption may displace healthier options from the diet.

Artificially sweetened beverages are also often confused with water, which contributes to widespread misconceptions. Despite being free of sugar, they are ultra-processed, containing additives such as colourants and chemical flavour compounds, none of which support hydration or provide nutritional value.

Oral and Bone Health Concerns

The acidic additives commonly found in soft drinks, including “zero” versions, can gradually erode dental enamel and increase susceptibility to cavities. Additionally, phosphoric acid—frequently present in cola-based beverages—has been associated with reduced bone mineral density, according to studies published in The American Journal of Clinical Nutrition.

Potential Risks Linked to Artificial Sweeteners

Artificial sweeteners are designed to provide sweetness without contributing calories because they are not metabolised by the body. However, the sweet taste itself can initiate an insulin response in anticipation of glucose that never arrives.

Recent evidence suggests these compounds may alter the gut microbiome and interfere with glucose and lipid regulation. In 2023, the World Health Organization (WHO) classified aspartame as “possibly carcinogenic to humans”, while maintaining that acceptable daily intake levels—up to 40 mg per kilogram of body weight—remain safe.

Scientific literature, including reviews in Nature Medicine, has documented how alterations to the gut microbiota caused by certain sweeteners may affect metabolic health, adding further complexity to the debate.

Rethinking Beverage Choices

Health agencies worldwide, including the Brazilian Ministry of Health, do not recommend the consumption of soft drinks—whether sugar-sweetened or artificially sweetened. For those attempting to reduce their dependence on these beverages, nutrition experts advise opting for natural preparations.

While water remains the optimal choice, alternatives such as infused water, naturally brewed iced teas and coconut water can aid in adapting the palate away from excessive sweetness. These options offer hydration without the metabolic drawbacks associated with soft drinks.

A Public Health Perspective

The latest findings reignite ongoing discussions on the safety of artificial sweeteners and the long-term effects of “zero-sugar” beverages. As research continues to evolve, public health specialists emphasise that the absence of calories does not equate to nutritional benefit. Instead, they encourage a broader approach to dietary education, focusing on whole foods and reducing reliance on ultra-processed products.