Paper 3

Clinician's Opinion:

Coffee and Tea as Hydration Anchors for Older Adults

Qing Ni, MD. Newnan Neurology. Newnan, GA, USA

Coffee and tea may help support hydration in older adults for a reason that is often overlooked: they create a dependable daily drinking routine. The benefit is not simply the pharmacologic effect of caffeine. For many older adults, a morning coffee or scheduled cup of tea provides a familiar cue to consume fluid—even when they do not feel thirsty.

Aging can reduce thirst perception and impair the body's ability to conserve water. As a result, older adults may not recognize fluid needs promptly, particularly during illness, hot weather, limited mobility, or use of medications that affect fluid balance. Dehydration is common among hospitalized older adults and is associated with delirium, falls, acute kidney injury, urinary tract infections, prolonged hospitalization, and increased mortality. [1] [2]

Why routine matters

Older adults frequently drink according to routine rather than thirst. A cup of coffee in the morning, tea with breakfast, or an afternoon tea break can become a practical behavioral prompt for fluid intake. This is important because relying only on thirst may be inadequate in later life.

For habitual caffeine users, avoiding coffee or tea may also lead to caffeine-withdrawal symptoms, such as headache, fatigue, reduced alertness, or difficulty concentrating. The desire to avoid these symptoms can reinforce a regular coffee or tea routine. However, it is more accurate to describe caffeine withdrawal as a possible contributor to the habit of beverage consumption—not as a proven physiologic mechanism that protects against dehydration. The hydration benefit is primarily the fluid volume consumed and the consistency of the routine.

Coffee and tea do count as fluid

The longstanding concern that coffee and tea are inherently dehydrating is overstated for usual intake. Caffeine can have a mild diuretic effect, particularly in large doses or in people not accustomed to caffeine. However, with moderate habitual use, the water contained in coffee and tea generally contributes to daily fluid intake rather than causing net dehydration. Reviews of available evidence conclude that moderate caffeinated beverages are compatible with maintaining hydration. [3] [4]

This does not mean coffee or tea should replace all other fluids. Water remains an excellent choice, and a varied fluid pattern is generally preferable. Still, discouraging an older adult from drinking moderate amounts of coffee or tea solely because of dehydration concerns may inadvertently remove one of their most reliable fluid-intake habits.

Practical use in geriatric care

Coffee and tea may be used as part of an individualized hydration plan:

Encourage a regular beverage schedule rather than waiting for thirst.
Pair coffee or tea with a glass of water, especially in the morning and with medications.
Offer preferred beverages at meals and between meals; flavor and familiarity often improve intake.
Consider decaffeinated coffee or tea later in the day when caffeine contributes to insomnia, palpitations, reflux, tremor, anxiety, urinary urgency, or nocturia.
Avoid excessive caffeine intake, highly sweetened drinks, and energy drinks.
Individualize fluid goals for patients with heart failure, advanced kidney disease, hyponatremia risk, or prescribed fluid restriction.

The key message

For many older adults, coffee and tea are not merely caffeinated drinks. They are daily rituals that can prompt regular fluid consumption when thirst no longer provides a reliable signal. Moderate coffee and tea intake can contribute to hydration, particularly when incorporated into a broader routine of scheduled fluids and individualized attention to medical conditions. The principal benefit is not caffeine itself, but the reliable habit of drinking.

Sources:

Hydration and outcome in older patients admitted to hospital (the HOOP prospective cohort study). Age and Ageing, 2015
Prevalence of low-intake dehydration in hospitalized older adults: systematic review and meta-analysis. BMJ Public Health, 2026
The role of alcohol, sports drinks, and caffeinated beverages in preventing heat-related illness. Journal of Occupational and Environmental Medicine, 2025
Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: nutrition and athletic performance. Journal of the Academy of Nutrition and Dietetics, 2016