Hydration tracking devices proliferate as experts debate their accuracy and utility

A range of hydration monitoring devices have entered the consumer market, with experts offering mixed assessments of their reliability.

• The 2026 World Cup has introduced mandatory hydration breaks in every match for the first time.
• Andreas Flouris of the University of Thessaly said most tested sweat sensors do not show expected accuracy.
• Roozbeh Ghaffari, CEO of Epicore Biosystems, stated that peer-reviewed papers support his company's wearables for workouts of 30 minutes or longer.
• Tamara Hew-Butler of Wayne State University questioned whether hydration technology might increase users' anxiety about their health.