Commercial electrolyte hydration drinks (e.g., LMNT, Liquid IV) provide meaningful hydration or health benefit beyond plain water for the general population

Summary

For generally healthy adults drinking to thirst, plain water is sufficient for hydration; randomized comparisons (e.g., the Beverage Hydration Index work by Maughan et al.) show that while beverages with sodium and some macronutrients are retained slightly better than water over 2-4 hours, this advantage is not clinically meaningful at normal intakes and does not translate to improved health outcomes. Major sports-nutrition guidelines (ACSM, IOC) endorse electrolyte replacement specifically for prolonged/intense exercise or heat stress, not for routine daily hydration. High-sodium products like LMNT (~1 g Na per stick) push sodium intake well above the population-level upper recommendations from WHO (<2 g/day) and AHA (<2.3 g/day ideal, <1.5 g/day preferred), which is directionally opposite to guidance for CV risk. Liquid IV's 'Cellular Transport Technology' invokes the oral rehydration WHO formula, but ORS is validated for dehydration from illness, not for healthy people. Thus for the target marketing audience (general consumers seeking 'better hydration'), the benefit claim is not supported by evidence; for athletes/clinical dehydration it has a legitimate, narrower role.