The thirst-quenching capacity of carbonated thickened drinks

• Carbonation did not improve thirstiness sensation or dry mouth in thickened drinks. • The carbonation type had no significant impact on the studied parameters. • Oral moisture decreased after consuming thickened water, regardless of carbonation. Thickened drinks can be prescribed to ensure the safety of individuals with swallowing difficulties. However, these beverages, especially those with starch-based thickeners, are often less appealing because of their texture and taste. Previous research has indicated that carbonation in water can improve beverage likeability and stimulate muscular activity, potentially helping in safer swallowing. This study investigates the potential of adding carbonation to thickened drinks to enhance oral hydration and alleviate dry mouth and thirst sensations. Nine different water samples prepared with or without a thickener (xanthan gum-based or starch-based) and with still or carbonated water (powder- sparkling water and sparkling commercial water) were studied. Oral moisture, dry mouth, and thirst-quenching sensations were measured before, immediately after, and 5 min after consumption. The two types of carbonation created resulted in different distribution of bubbles. Oral moisture was reduced after consuming thickened water. In addition, the thickened water, with or without carbonation, did not alleviate thirst or dry mouth. Despite the potential safety benefits of carbonation, it did not improve thirst or dry mouth sensations. Future research should explore other stimuli to enhance thirst-quenching capacity, like flavour addition to carbonation to enhance adherence to thickened beverages and body stimulation.