Why Top Athletes Limit Water Intake After 4 p.m. and Why You Might Try It Too

Staying hydrated is crucial for maximizing performance, mental clarity, physical endurance, and recovery, whether you're in the sports elite or a casual fitness enthusiast.

Matt Jones, a seasoned sports nutritionist collaborating with the supplement company Cadence and who was part of the Boston Celtics' successful 2024 NBA Championship team, highlights that professionals have fine-tuned their hydration strategies.

"The secret to performing at one's peak lies in the habitual practices athletes develop; consistency in nutrition is the backbone of this," he mentioned to Business Insider.

Through his extensive experience with top-tier athletes and military personnel, Jones offers five essential strategies for maintaining optimal water and electrolyte levels to enhance daily alertness and vigor.

Identifying Dehydration

Ensuring you stay well-hydrated is vital for optimal brain function and physical performance, whether at the office or on the court, says Jones.

"Your hydration levels can affect your mood, decision-making capabilities, and even your day-to-day activities," he shared.

Jones uses a proven method to determine if athletes need to increase their water intake, which you can apply to self-assess dehydration:

1. Feeling thirsty upon waking. Dehydrating during the night is common, so waking up parched is a cue to start hydrating.

2. Fluctuations in weight. A slight overnight weight decrease of 1% or more can signify fluid loss.

3. Darker urine. Urine should typically be pale or light yellow; a darker hue approaching amber could indicate dehydration.

Daily Water Requirements

Jones recommends about 1 to 1.5 milliliters of water for every calorie burned.

For example, if you expend 2,000 calories daily, aim for roughly two liters or about eight cups of water—an oft-repeated guideline from childhood.

More physical activity or higher body weight increases your hydration needs likewise.

Timing Your Hydration

Drinking plenty of water too late can be counterproductive due to sleep disturbances from frequent restroom visits.

Jones advises his athletes, including those from the Celtics, to consume 80% of their daily water intake before 4 p.m., allowing ample time for their systems to handle the liquid before sleeping.

Hydration Beyond Water

While plain water should be your primary source of hydration, non-water beverages and even certain foods contribute to your daily total.

Your routine morning coffee can aid hydration when consumed moderately to keep caffeine's adverse effects at bay.

"Though caffeine can dehydrate due to its nature, when in coffee or tea, it provides a net fluid gain," Jones explained.

Consuming water-rich foods like fruits and vegetables delivers necessary electrolytes to manage your body's fluid balance.

Nutritional Balance

Sodium is essential, yet most diets provide sufficient amounts. Jones suggests centering on adequate potassium to balance sodium intake and mitigate high blood pressure.

Foods rich in potassium include bananas, avocadoes, coconut water, pomegranates, and watermelon.

Preemptive Hydration

While casual sipping while working is fine, waiting to drink until you're thirsty during taxing workouts means you're already on the path to dehydration.

"Thirst isn't a reliable measure during strenuous exercise, particularly in hot conditions," he noted. "People often play catch-up with their hydration."

Finding your sweat rate can help gauge your fluid replacement needs during workouts, as Jones advises his professional clients.

To avoid a drop in performance, maintain regular hydration intervals throughout the day.

"Prioritize rehydration as soon as you start your day, right from the moment you arise," he recommends.