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The unique composition of electrolytes and nutrients explains why milk hydrates better and for a longer duration than other beverages.
A study conducted by researchers at the University of St. Andrews in Scotland revealed that certain common everyday beverages may be more effective in maintaining body fluid levels than water.
The results indicate that while pure water is excellent for quick hydration, milk hydrates better due to its unique nutritional composition. The presence of electrolytes, proteins, and fats in the food slows gastric emptying, keeping the individual hydrated for a significantly longer period.
The research compared the hydration responses of various popular beverages, analyzing how the body retains fluids after consumption. According to the collected data, milk hydrates better because it contains nutrients that the body processes more slowly, preventing the liquid from being filtered and expelled quickly by the kidneys.
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While water passes quickly through the digestive system, the components of milk act as “anchors,” prolonging the presence of hydration in the body.
The science behind fluid retention
The study highlighted that the effectiveness of a beverage does not depend solely on the volume consumed, but on how metabolism interacts with its properties. In the case of skim and whole milk, sodium acts like a sponge, retaining water in the body and producing less urine than the consumption of drinking water. This mechanism explains why milk hydrates better in situations where constant access to liquids is limited or during periods of physical recovery.
In addition to electrolytes, lactose (the natural sugar in milk) and proteins play a crucial role in the absorption process. These substances require more complex digestion, which slows the rate at which the stomach releases its contents into the small intestine.
As a result, the flow of water into the bloodstream occurs gradually, ensuring that milk hydrates better and in a more sustained manner over the hours following consumption.
Comparison with sports drinks and other alternatives
The experiment also included isotonic drinks and fruit juices, but milk showed higher retention rates in most long-term tests. Although sports drinks are formulated to replenish minerals lost in sweat, the nutrient density of milk offers a natural biological advantage. The study reinforces that milk hydrates better even than oral rehydration solutions in resting contexts or moderate daily activities.
For people looking to maintain hydration balance during work or long trips, replacing part of water consumption with milk can be an efficient strategy. However, researchers emphasize that pure water remains essential for overall health and cellular function.
The central point of the discovery is that milk hydrates better in terms of the liquid’s residence time in the system, without replacing the universal need for drinking water.
Practical Applications and Nutritional Recommendations
The discovery has important implications for athletes and individuals working in high-temperature environments. Knowing that milk hydrates better allows for smarter planning of fluid intake, especially when frequent breaks for drinking water are not possible.
Including this beverage in the routine can help prevent chronic dehydration more effectively than the isolated consumption of hypotonic liquids.
Despite the benefits, the study warns about excessive consumption due to the caloric value of the beverage, unlike water, which is calorie-free. The balance between different sources of liquids is key to optimized health.
Scientists conclude that milk hydrates better from the perspective of physiological persistence, offering a new tool for managing human hydration in various climatic and activity conditions.
With information from DailyGalaxy
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