The claim that soda generally makes people thirstier is not established by the evidence reviewed. Thirst is a subjective sensation, while hydration concerns fluid balance; a study measuring one does not automatically answer the other.
A randomized trial involving 72 healthy, initially hydrated men found no significant difference in four-hour urine output between cola, diet cola and still water. Separately, experiments with thirsty adults found that carbonation increased short-term thirst quenching, measured by how much additional water participants drank.
Neither result establishes how every sweetened soda affects thirst over time. The carbonation experiments used carbonated water, while the cola trial measured fluid retention rather than perceived thirst. These findings challenge simple explanations based on dehydration or carbonation, but do not conclusively confirm or refute the broad claim across drinks and circumstances.
Feeling thirsty and being dehydrated are different, and the evidence reviewed does not establish that soda generally increases thirst.
Maughan and colleagues
The randomized beverage hydration trial found no significant difference in cumulative four-hour urine output for cola or diet cola versus still water. It did not directly measure whether soda increased perceived thirst.
Based on: The American Journal of Clinical Nutrition — PubMed
Peyrot des Gachons and colleagues
Participants drank less additional water after carbonated water than after still water under the tested conditions. This challenges carbonation as a general thirst-increasing mechanism, but does not directly test every soda formulation.
Based on: PLOS ONE
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