Research indicates that additives in ultra-processed foods may negatively affect the health of our gut microbiome, a complex community of trillions of microbes that plays a crucial role in our overall well-being. Experts, including Melissa Lane from Deakin University and Sarah Berry from King's College London, describe the microbiome as an essential ecosystem that contributes to our health.
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Ultra-processed foods (UPFs) are often loaded with emulsifiers, artificial sweeteners, and food colorings, which enhance flavor and texture while extending shelf life. For example, many supermarket products, including seemingly healthy options like chicken salads, contain emulsifiers that improve consistency and longevity.
Studies involving mice led by Benoit Chassaing at the Institut Pasteur in Paris have shown that low doses of certain emulsifiers can cause harmful changes in gut bacteria, leading to inflammation and various health issues. Normally, a protective mucus layer keeps gut microbes at a safe distance from the gut wall, but emulsifiers can damage this layer and initiate chronic inflammatory diseases.
Human studies also reflect potential health risks associated with emulsifiers. A 2024 study in France involving over 100,000 adults found a correlation between emulsifier consumption and increased risk of type 2 diabetes. Another study of over 90,000 adults suggested links between emulsifiers and breast and prostate cancers. Additionally, a small trial by Chassaing revealed that consuming a common emulsifier disrupted gut bacteria in healthy individuals.
In a clinical trial focused on Crohn's disease, participants on a restricted emulsifier diet showed three times more likelihood of experiencing symptom relief than those consuming regular amounts of emulsifiers. Despite these findings, there are no official guidelines advising the avoidance of emulsifiers, partly due to the vast number of food additives and the lack of definitive studies on their combined effects.
The European Food Safety Authority (EFSA) and the U.S. Food and Drug Administration (FDA) maintain that food additives, including emulsifiers, must be officially assessed for safety before being permitted for use. However, they have not undergone thorough testing regarding their direct impact on gut microbiota.
Furthermore, a study comparing diets rich in ultra-processed foods to those with minimally processed ingredients found that the latter resulted in greater microbiome diversity and fewer digestive issues. Lane indicated that the variety of fibers in whole foods likely contributes to these positive effects.
Experts recommend a practical approach for individuals concerned about emulsifiers and ultra-processed foods: prioritize cooking with fresh ingredients where possible. While completely avoiding additives may be unrealistic, increasing the consumption of whole foods can benefit both personal health and microbiome diversity.