Do elderly persons need to be encouraged to drink more fluids?

Area of Science:

• Gerontology
• Nutrition Science
• Internal Medicine

Background:

• A modified food guide pyramid recommends 8 glasses (2 liters) of fluid daily for individuals over 70.
• This recommendation is widely disseminated but lacks strong evidence.
• Concerns exist regarding potential negative health impacts of excessive fluid intake in the elderly.

Purpose of the Study:

• To investigate the necessity and potential risks of the recommended high fluid intake for individuals over 70.
• To examine the relationship between fluid consumption and various health indicators in the elderly population.

Main Methods:

• A cohort of 883 elderly participants (mean age 74.1 years) was recruited from Medicare rolls, including Hispanic and non-Hispanic white men and women.
• Data collected included self-reported daily fluid intake, blood pressure (lying and standing), fall history, and prevalence of chronic constipation, fatigue, or tiredness.
• Serum samples were analyzed for sodium, urea nitrogen (SUN), and creatinine levels to calculate SUN/creatinine ratios.

Main Results:

• 71% of participants reported fluid intake equal to or exceeding six glasses daily.
• No cases of hypernatremia were observed in individuals consuming less than six glasses.
• Fluid intake showed no significant association with blood pressure, history of falls, or symptoms of constipation or fatigue.

Conclusions:

• Encouraging fluid intake above an individual's comfortable level for the elderly lacks sufficient evidence of health benefits.
• Further research is needed to establish evidence-based guidelines for optimal fluid intake in older adults.
• Current hydration practices among the elderly appear adequate and do not warrant mandatory increases without proven advantages.