From controlling body temperature and flushing out toxins, adequate hydration plays a vital role in our general health and well-being, water is a life essential. However, while dehydration garners significant attention, overhydration, or drinking excessive amounts of water, is a condition that can have serious and sometimes fatal consequences.

Although it may sound bizarre since drinking water is said to be the solution for most health related problems it is important to recognize how much water is considered "too much" or the risks involved with being overhydrated can maintain a healthy balance.

What Is Water Intoxication?

Water intoxication, also termed hyperhydration, water poisoning or water toxemia, develops when an individual drinks much more water than the kidney can excrete. The main function of the kidneys in the human body is the processing and excretion of excess water. However, the human kidneys can process only up to 0.8 to 1.0 liters of water at a time. Drinking an amount that exceeds this may overwhelm the kidneys and put the electrolyte balance out of sync in the human body.

Electrolytes, especially sodium, are essential in maintaining fluid balance within and outside cells. Hyponatremia is the condition when sodium levels fall below 135 mmol/L, resulting from excessive water intake. This causes water to shift into cells, swelling them. In the brain, this can cause severe complications, including coma or even death.

Symptoms of Water Intoxication

The symptoms of water intoxication vary from mild to severe. Early symptoms are often similar to dehydration, which makes self-diagnosis challenging. Common symptoms include:

• Headaches
• Nausea and vomiting
• Muscle cramps or weakness
• Fatigue or drowsiness
• Confusion and disorientation

In more serious cases, water intoxication can cause seizures, loss of consciousness, or swelling in the brain. These complications can be fatal if left untreated.

A notable case occurred in 2007 when a woman participating in a water-drinking contest tragically died after consuming nearly two gallons of water in under two hours. More recently, actress Brooke Shields experienced a grand mal seizure attributed to excessive water consumption.

Causes of Water Intoxication

Water intoxication is rare, but certain scenarios can increase the risk:

1. Sporting Events and Endurance Training

These endurance athletes are prone to water intoxication, especially if they drink large amounts of water without replacing lost electrolytes. Hyponatremia usually happens during long races or marathons as individuals mistake fatigue and muscle cramps for dehydration and continue drinking water in excess.

2. Military Training

Overhydration among military personnel is usually due to severe physical activity in extreme environmental conditions. The total number of hyponatremia cases documented from 2007 through 2022 for the active duty in the United States exceeds 1,600, with a note to this problem on exertion-related overhydration.

3. Mental Health Conditions

Compulsive water drinking, known as psychogenic polydipsia, is linked with some mental illnesses such as schizophrenia and psychosis. People with these conditions tend to drink too much water, causing a hazardous electrolyte imbalance.

4. Drug Abuse

Drugs such as MDMA (ecstasy) raise the body temperature and make people thirsty, and at times, some people tend to drink excess water at events like music festivals. MDMA also leads to urine retention, thus exacerbating the dangers of water intoxication.

How Much Water Is Too Much?

The exact amount of water that causes intoxication varies from one person to another. However, drinking more than 1 liter of water per hour for several hours raises the risk. For healthy individuals, the risk of overhydration is low unless taking part in extreme physical activity or ignoring thirst cues.

Certain medical conditions, such as kidney or liver disorders, can impair the body's ability to process fluids, and even moderate water intake may be harmful. Similarly, certain medications, such as diuretics and antipsychotics, can affect the perception of thirst or fluid regulation.

How Much Water Is Enough?

The widely touted recommendation of eight 8-ounce glasses of water per day has little basis in fact. According to the National Academy of Medicine, a daily total fluid intake is about 15 cups (3.7 liters) for males and 11 cups (2.7 liters) for females, from beverage sources and from food. Usually, about 20 percent of daily hydration comes from foods such as fruits and vegetables.

A better rule of thumb is to listen to your body and drink water based on thirst. Use the color of your urine as an indicator:

• Light yellow urine indicates proper hydration.
• Dark yellow urine may indicate dehydration.

Older adults, whose thirst mechanisms may decline with age, should be proactive about maintaining hydration, especially during illness or hot weather.

Water Intoxication vs. Dehydration

The symptoms of water intoxication—such as headaches, fatigue, and muscle weakness—are similar to those of dehydration. If you are unsure which condition you are experiencing, seek medical attention immediately rather than self-treating with more water.

Preventing Water Intoxication

To avoid the dangers of overhydration:

• Drink water gradually throughout the day rather than consuming large amounts at once.
• Replace lost electrolytes post high-intensity exercise or heavy sweating.
• Consider using sports drinks or salty snacks to help replenish sodium.
• Keep track of fluid consumption during long-duration activities, and do not consume more water than the body is losing in terms of electrolytes.
• If on medications or have specific medical conditions, check with your doctor regarding the safety of drinking water.

For signs of severe water intoxication-including confusion, drowsiness, seizures, and loss of consciousness-customer is advised to seek medical assistance immediately. In the meanwhile, a salty snack would help to temporarily correct low sodium levels.

Hydration is important to health, but overhydration can be a serious risk; the secret is in finding a balance. Drink enough water to satisfy your body, but not so much that it overwhelms your system. Remember, water is life, but moderation keeps it that way.

Hyponatremia (low sodium level in the blood). National Kidney Foundation. 2023.

Water Toxicity. NIH. 2023

Exercise-Associated Hyponatremia: 2017 Update. Front Med (Lausanne). 2017

Update: Exertional Hyponatremia Among Active Component Members of the U.S. Armed Forces, 2007–2022

A major international study has revealed that 99% of heart attacks, strokes, and serious cardiovascular events are linked to just four common health risk factors: high blood pressure, high cholesterol, elevated blood sugar, and tobacco use.

The research drew on data from more than 9 million adults in the United States and South Korea, making it one of the largest studies of its kind. Published in 2025, the findings underscore the vital role of early prevention and lifestyle management in reducing cardiovascular risk, as per NDTV.

Even among younger women under 60, a group generally considered at lower risk, over 95% of heart attacks, strokes, and other major cardiovascular events were connected to at least one of these four factors.

High Blood Pressure Leads The Risk

High blood pressure, or hypertension, stood out as the biggest contributor, affecting more than 93% of people who suffered a heart attack, stroke, or heart failure.

“We believe this study demonstrates very clearly that exposure to one or more of these preventable risk factors before major cardiovascular events is nearly universal,” said senior author Dr. Philip Greenland, professor of cardiology at Northwestern University Feinberg School of Medicine.

He added, “The focus now should be on controlling these modifiable factors rather than chasing other less treatable or non-causal risks.”

How Can High Cholesterol Lead To Diabetes?

High cholesterol can trigger heart attacks by contributing to plaque buildup, or atherosclerosis, along the walls of arteries, as per Mayo Clinic. This buildup narrows the arteries and limits blood flow to the heart. If a plaque ruptures, it can cause a blood clot to form, fully blocking the artery. This prevents oxygen-rich blood from reaching the heart muscle, resulting in tissue damage or death, often in the coronary arteries.

How Does Elevated Sugar Lead To Diabetes?

Consuming too much sugar harms blood vessels, triggers inflammation, and contributes to weight gain, high blood pressure, and poor cholesterol levels. Together, these effects speed up plaque buildup (atherosclerosis) in the arteries, limiting blood flow and sharply increasing the risk of a heart attack.

Excess sugar is converted into fat, raises triglyceride levels, lowers “good” HDL cholesterol, and can lead to insulin resistance, creating a cluster of metabolic problems, known as metabolic syndrome—that directly strain the heart.

Early Detection and Management Are Key

The results highlight the urgent need for regular health checks, early screening, and proactive management of common conditions to prevent life-threatening heart problems.

Greenland and his team also point out that their findings challenge earlier reports suggesting cardiovascular events can occur without risk factors. They argue that previous studies may have missed subtle conditions or overlooked risk factors that were below clinical thresholds.

In a related editorial, Duke University cardiologist Dr. Neha Pagidipati, who was not involved in the study, stresses that addressing these health risks early is critical to preventing severe and potentially fatal cardiovascular outcomes.

A smartphone app called Are You Dead? has rapidly climbed the charts in China, striking a chord with young adults who live alone in fast-growing urban centres. The app asks users to regularly confirm that they are still alive, and in recent weeks it has become the country’s most downloaded paid application.

Its stark idea may sound unsettling, but that very premise appears to be what draws people in. Beyond its novelty, the app reflects a deeper issue, showing how living alone, along with rising mental health concerns, is increasingly being viewed as a public health issue.

What Is Are You Dead?

An app named “Are You Dead?” hardly sounds inviting at first glance. Still, for many people who live by themselves, it has turned out to be more comforting than alarming. Its strength lies neither in flashy features nor complex technology, but in how plainly it speaks to a fear most people keep to themselves.

The app, known as Sileme in Chinese, was launched in May and has already become the most downloaded paid app in the country. It is designed for those who live alone and worry about what could happen if they fall ill, meet with an accident, or suddenly collapse with no one nearby to help. For users without close family or regular social contact, this fear is not abstract. It is part of everyday life.

The idea behind the app is straightforward. Users are required to check in every two days by tapping a large button to confirm they are okay. If they fail to do so, the app alerts a pre-selected emergency contact, signalling that something may be wrong.

When it first launched in May last year, the app attracted little attention. That changed dramatically in recent weeks, as large numbers of young people living alone in Chinese cities began downloading it.

On the Apple App Store, the app is described as a “lightweight safety tool designed for people who live alone, offering quiet protection through regular check-ins and emergency contact features to make solo living feel safer.”

Who Is Are You Dead For?

Are You Dead? refers to itself as a “safety companion” for people who live alone, whether due to work, education, or a personal preference for living independently. It is aimed at those vulnerable to social isolation, including students, working professionals, and older adults living by themselves in cities. According to the Chinese media outlet Global Times*, China may have as many as 200 million single-person households by 2030, underlining why digital tools like this are finding a ready audience.

How Living Alone Can Lead To Increased Health Concerns

Living alone can affect health in several ways, mainly through loneliness and reduced social contact. These factors are linked to higher risks of depression, anxiety, cognitive decline, heart disease, stroke, diabetes, weakened immune function, and even early death. Living alone can also influence daily habits, increasing the likelihood of falls, poor nutrition, smoking, and unsafe alcohol use, particularly among older adults, while making it harder to manage existing health conditions.

When people think about staying healthy, they usually focus on diet, exercise, and sleep. The role of social connection in protecting health is often overlooked. Loneliness, and the rise in stress hormones like cortisol that often comes with it, can quietly take a toll on the body.

“We clearly understand how sitting too much, smoking, and obesity contribute to chronic disease,” says psychologist Amy Sullivan, PsyD. “Loneliness should also be seen as a risk factor for long-term health problems.”

Health risks linked to loneliness include:

• High blood pressure.
• Cold and flu.
• Cardiovascular disease.
• Stroke.
• Type 2 diabetes.
• Dementia.
• Anxiety.
• Depression.
• Suicide and self-harm.
• Premature death.

“We know how stress affects the body, and loneliness is a powerful form of stress,” adds psychologist Adam Borland, PsyD, as cited by the Cleveland Clinic. “When people feel lonely, they are less likely to care for themselves properly, and that can eventually lead to serious health problems.”

Been feeling a certain tightness across your chest, wheezing or coughing uncontrollably? Your lung health may be at risk

Dr Killol Patel, a board certified pulmonologist in New Jersey, explains that respiratory symptoms are common when running in cold weather due to a lack of moisture in the air and lung spasms.

He said: "The moist lining of your nose and mouth normally warms and moistens inhaled air before it goes to the lungs. But when it’s dry and cold and you’re breathing fast during exercise, the air may not get as conditioned.

"That can lead to not only coughing and wheezing, but trouble catching your breath, chest tightness and the urge to cut your run short."

The lungs have a defensive natural protective mechanism known as bronchospasm which activates whenever the organ detects a sense a potential irritant or damage. "When you breathe in air that’s dry and cold, your lungs may spasm as a means of protection. They think there’s something noxious in the air," he elaborated.

Those suffering from respiratory issues such as exercise-induced asthma or have irritated or inflamed airways may experience worse symptoms of bronchospasm, Dr Patel warns.

The expert said: "In those cases, your lungs are already on edge, so there’s no buffer. Exercising in the cold, dry air can take you over the edge more quickly. Your heart may then start racing, and your body tells you to stop. Mucus may also build up to clog your airways."

What Can You Do To Protect Your Lungs?

Dr Patel advises staying warm and dry through moisture-wicking layers for comfort. The expert adds that runners should consider covering their nose and mouth with a scarf or mask as they start moving.

“It creates a small bubble of warmer air to breathe,” Dr. Patel says. (Once you acclimate, however, you may not need it anymore, he adds.)

He also recommends hydrating well before starting a run as dehydration can make you "more prone to bronchospasms, especially people with asthma".

Dr Patel suggests avoiding smoggy routes and dirty areas as pollution as well as germs can further amplify symptoms and worsen the situation. “If it’s cold on top of that, [poor air quality] can make breathing and symptoms worse,” he told Hackensack Meridian Health.

A 2023 Journal of Allergy and Clinical Immunology study suggests that when the temperature inside the nose drops in cold weather, it may hamper the nose’s first-line, natural defense mechanism against viruses that cause upper respiratory infections and make the body more prone to illnesses.

Do Breathing Exercises Help?

• Warm up your airways
• Inhale through your nose rather than your mouth
• Slow down your pace and focus on rhythmic breathing

Lastly, Dr Patel advises avoiding tobacco smoke and air pollutants (both indoors and out) and getting regular health checkups.