4 Hydration-Harming Drinks to Avoid When Dehydrated, Says a Dietitian

Maintaining proper hydration is essential for nearly every bodily function, from regulating temperature to ensuring cognitive clarity. However, not all liquids contribute equally to the body’s hydration status and some can actually exacerbate fluid loss.

Certain beverages contain ingredients that act as diuretics or create osmotic imbalances, which can hinder the body’s ability to retain water. According to guidance provided by a dietitian via EatingWell, there are four specific types of drinks to avoid when experiencing symptoms of dehydration.

The Impact of Alcohol on Fluid Retention

Alcohol is one of the most significant beverages to avoid when the body is already low on fluids. It functions as a diuretic, meaning it encourages the kidneys to release more water into the urine than they would otherwise.

This occurs because alcohol inhibits the production of antidiuretic hormone, often referred to as ADH. When ADH levels drop, the kidneys stop reabsorbing water, leading to increased urination and a further decrease in total body water.

Consuming alcohol while dehydrated can accelerate the onset of symptoms such as dizziness, dry mouth, and fatigue, making it counterproductive for recovery.

High-Sugar Beverages and Osmotic Pressure

Sugary drinks, including many sodas and processed fruit juices, can impede the hydration process due to their high solute concentration. These beverages are often hypertonic, meaning they have a higher concentration of particles than the fluids found in the body’s cells.

When a high concentration of sugar enters the digestive system, the body may draw water out of the surrounding tissues and into the gut to dilute the sugar. This process, known as osmosis, can temporarily pull water away from where it is needed most in the body.

While these drinks provide liquid, the osmotic effect of the sugar can slow down the actual absorption of water into the bloodstream, delaying the relief of dehydration symptoms.

The Combined Risks of Energy Drinks

Energy drinks often present a double challenge to a dehydrated person because they typically combine high levels of caffeine with high amounts of added sugar.

The caffeine acts as a mild diuretic, increasing the frequency of urination, while the sugar creates the osmotic pressure described above. Together, these ingredients can increase fluid loss while simultaneously slowing the absorption of the water contained in the drink.

the stimulants found in energy drinks can increase heart rate and body temperature, which may lead to further fluid loss through perspiration.

Excessive Caffeine Intake

While moderate consumption of coffee or tea is generally acceptable for most healthy adults, excessive amounts of caffeine can be problematic during periods of dehydration.

Caffeine is a known mild diuretic that increases blood flow to the kidneys and inhibits the reabsorption of sodium. This can lead to an increase in urine output, which may outweigh the hydrating benefits of the water used to brew the coffee or tea.

For individuals who are already significantly dehydrated, the additional fluid loss caused by high doses of caffeine can hinder the body’s ability to return to a state of equilibrium.

Effective Rehydration Alternatives

To effectively reverse dehydration, the focus should be on liquids that are easily absorbed and do not trigger excessive fluid loss. Plain water remains the most effective choice for general hydration.

In cases where dehydration is caused by intense exercise, heat exposure, or illness, the body loses not only water but also essential electrolytes like sodium and potassium. In these instances, water alone may not be sufficient.

Oral rehydration solutions, which contain a precise balance of salts and sugars, are designed to maximize water absorption in the small intestine. Other options include coconut water or water enhanced with a small amount of salt and lemon to help the body retain the fluid more efficiently.

Prioritizing these isotonic or hypotonic options ensures that fluids enter the bloodstream and cells quickly without the diuretic or osmotic interference caused by alcohol, excessive caffeine, or high sugar concentrations.