Carrier solvents are used to add flavours and aromas to a variety of different foods and drinks. Since they are not considered additives, producers are not required by law to declare them on the ingredients label. Two commonly used carrier solvents are ethanol and propylene glycol (Figure 1) which are used to dissolve the flavour ingredients of the aroma when added to the formulation. These components are not separately declared on the ingredients list as they are part of the aroma.
When compounds such as ethanol and propylene glycol are repeatedly ingested through soft and energy drinks, they may contribute to physiological changes that affect energy levels, sleep patterns, and emotional regulation, especially in sensitive individuals. Over time, these factors can play a role in feelings of restlessness, low mood, or heightened anxiety, reinforcing the importance of understanding how diet and environment interact with overall health.
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Recognizing the many subtle influences on physical and emotional well-being encourages a broader, more preventive view of health, one that considers nutrition, metabolism, sleep, and hormonal balance alongside mental resilience. Sustainable progress often depends on consistent monitoring, informed guidance, and gradual lifestyle adjustments rather than short-term fixes, since long-term habits shape how the body regulates energy, weight, and mood over time.
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Extending this broader view of how nutrition and lifestyle shape overall well-being, metabolic health becomes an important area of focus, particularly when considering how consistent dietary patterns influence blood sugar regulation over time. Irregular eating habits, high intake of processed foods, and hidden ingredients in everyday products can gradually affect how the body processes glucose, potentially increasing the risk of imbalances that may develop into more complex conditions such as Diabetes. These changes are often subtle at first, but over time they can impact energy stability, appetite signals, and overall metabolic function, making it more difficult for the body to maintain equilibrium.
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Figure 1: Structures and chemical formula of ethanol and propylene glycol found in several soft drinks.
Despite their possible negative effects on human health, we have found relatively large amounts of these two compounds in several soft and energy drinks. Table 1 lists the commercial products analyzed in this study.
Table 1: Overview of the analyzed soft and energy drinks and the concentration of ethanol and propylene glycol.
The 1H NMR spectra of these soft and energy drinks were recorded on a Spinsolve 80 MHz Carbon Ultra system with a WET solvent suppression sequence. No sample preparation except for removing remaining bubbles by shaking was applied. Figures 2 and 3 show the spectra of the energy and soft drinks, respectively. While a number of components can be identified in the different spectra, in this work we focused our attention on the region between 1 and 1.3 ppm (red box in both figures). In this region we can observe the signals of the methyl groups of ethanol (triplet) and propylene glycol (doublet). Although the doublet of propylene glycol overlaps with two of the peaks of ethanol, the left peak of the ethanol triplet appearing at about 1.17 ppm does not overlap and can be beautifully used for quantification. Once the amount of ethanol is known, the concentration of propylene glycol can be calculated as the difference between the total integral and the extrapolated full signal of ethanol. In this work we used pure ethanol as external standard for the quantification. The measured contents of both compounds for each sample are listed on Table 1.
Figure 2: Spectra of the energy drinks. The region where the signals of ethanol and propylene glycol appear in the spectra is marked with a red box. The dark cyan region indicates the residual water signal.
Figure 3: Spectra of the soft drinks. The area where the signals of ethanol and propylene glycol appear in the spectra is marked with a red rectangle. The dark cyan region indicates the residual water signal.
Special thanks go to John Edwards from Process NMR (www.process-nmr.com) for his valuable help to identify some of the components present in the set drinks.