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

Metformin is a safe and effective drug used by type 2 patients for the last six decades to control their blood sugar levels and improve the way the body handles insulin.

A recent study showed that metformin can also be crucial in reducing the risk of vision loss in people over the age of 50, known as age-related macular degeneration (AMD).

The observational study, published in the BMJ Open Ophthalmology, showed that metformin can cut down the cases of AMD by nearly 40 percent in people with Type 2 diabetes over five years.

“We have found a significant association between metformin use and a reduction in the incidence of intermediate AMD by 37 percent in people with diabetes over 5 years. Previous epidemiological studies of metformin and AMD have used secondary data on AMD,” said corresponding author Nicholas A. V. Beare, from the University of Liverpool, UK.

“Given metformin’s anti-aging therapeutic effects, the reduction in risk is plausible and warrants prospective clinical trials,” he added.

Also read: Metformin Controls Blood Sugar With Help From Brain Neurons, Finds Study

Metformin And AMD

While currently there is no specific treatment option for AMD — a common cause of blindness in high-income countries — scientists have shown interest in metformin as a candidate drug for treating AMD and reducing its progression.

It is because of metformin's antioxidant, anti-inflammatory, antiangiogenic, and antifibrotic effects. Metformin is also postulated to delay ageing and ageing-related diseases.

Previous research has also identified metformin as a potential treatment for all stages of AMD. Researchers also noted that the common diabetes drug is readily accessible and has a strong safety profile.

How Metformin Improves AMD

The BMJ study analyzed more than 2,500 participants aged 50 or above who attended retinopathy screening in 2011.

All participants had Type 2 diabetes and gradable fundus photographs — high-quality retinal images.

Individuals prescribed oral metformin had a 37 percent lower risk of intermediate AMD by five years. The results are consistent with known biological mechanisms, given metformin’s potential favourable effects on AMD progression, researchers reported, the researchers said.

The team, however, acknowledged limitations such as a lack of proper data regarding the dose, duration of prior use, or compliance with metformin use.

Further, there were only a relatively small number of participants developing advanced AMD – an inevitability in population-based studies. They urged for a clinical trail to prove metformin's potential in treating AMD.

Also read: World Sight Day: 10 Tips To Help Prevent Vision Loss In Elderly

What Is AMD?

Age-related macular degeneration (AMD) is a disease of the retina. It happens when a part of the retina called the macula is damaged. It results in the loss of sharp, straight-ahead vision.

The condition commonly affects adults over 50, and causes

• blurry vision,
• dark spots,
• distorted straight lines.

While AMD rarely causes total blindness but affects central vision, making reading and driving difficult. It is of two types:

• Dry Age-Related Macular Degeneration
• Wet Age-Related Macular Degeneration

Harry Potter star Daniel Radcliffe has quit smoking after 20 long years. The reason: his two–year–old son with girlfriend Erin Darke.

Speaking to media outlet Vulture, the 36-year-old English actor shared that after becoming a father, he was inspired by intrusive thoughts about his mortality, which enabled him to quit the deadly habit after two decades.

"I smoked for 20 years pretty heavily, and I was never even thinking about quitting, and then shortly after having my son, the intrusive thoughts of my own death really helped as an incentive to quit," Radcliffe was quoted as saying.

Radcliffe also shared how a book -- The Easy Way to Quit Smoking, by Alan Carr -- helped him decide to quit smoking.

"It may not work for everybody, but it really worked for me," noted the star, currently starring in the Broadway play Every Brilliant Thing.

Earlier this month, the actor spoke with WSJ Magazine and shared that from being on “cigarettes all day”, he's transformed into a fitness freak.

How Does Smoking Affect Our Body?

Smoking can affect all organs in our body. While lung cancer and tuberculosis are the most prominent ones, smoking can seriously increase the risk of several chronic diseases. These include:

• Heart Disease
• Asthma
• Reproductive Health
• Vision Loss
• Chronic Obstructive Pulmonary Disease
• Cancers of the liver, stomach, and colon.

While quitting tobacco is important, it is a difficult task, with some people finding it harder to quit than others. It may be important to seek help quitting.

Also read: Cigarettes And The Female Body: The Hormonal Toll We Don’t Talk About

What Happens When You Stop Smoking?

• In just 20 minutes of stopping, your blood pressure and heart rate begin to normalize.
• Within a few weeks, your lung function improves.
• Over time, the risk of heart disease and cancer also decreases dramatically.

These strategies have shown varying levels of success in aiding smokers to quit permanently. In addition, alternative methods like e-cigarettes and mindfulness-based techniques have gained traction in helping reduce smoking addiction.

Science-backed Methods To Help You Quit Smoking

Behavioral Support

Quitting smoking isn’t just about resisting cravings. Often, behavioral support through counseling or therapy is crucial for tackling the psychological aspects of addiction. Behavioral therapy involves working with a trained professional to identify triggers, develop coping strategies, and create a tailored quit plan. Research shows that combining counseling with other quit methods can significantly increase success rates.

Prescription Medications

Some medications, such as varenicline (Chantix) and bupropion (Zyban), have been shown to help people quit smoking by reducing cravings and withdrawal symptoms. Experts suggest that varenicline works by blocking the effects of nicotine in the brain, while bupropion is an antidepressant that helps manage withdrawal symptoms. Both medications are generally more effective when combined with behavioral therapy.

Nicotine Replacement Therapy (NRT)

Nicotine replacement products, such as nicotine patches, gums, lozenges, and nasal sprays, deliver controlled amounts of nicotine to ease withdrawal symptoms. According to experts at Harvard Health, NRT can double the chances of quitting by alleviating physical cravings while the person works on overcoming the psychological addiction.

About 10.6 percent –15 percent of India's population suffers from some form of mental health conditions, with 15 percent of the adult population also requiring active intervention.

To enable researchers to gather as well as systematically document data on patients with major forms of mental illness, neuroscientists in India have developed CALM-Brain — a digital repository of data on brain structure and function from a range of psychiatric disorders.

CALM-Brain contains data from over 2,000 participants from 900 families across the country.

CALM-Brain will help clinicians and researchers

• to understand the onset of neuropsychiatric disease
• check progression
• decode underlying biological changes
• provide better diagnosis
• plan personalized treatments for patients.

“CALM-Brain was conceived as a method to assemble data from multiple scales of analysis of brain structure and function on a single platform. We believe that the application of modern methods of data analysis to this dataset will help bridge the gap between these scales of analysis,” said Prof. Raghu Padinjat, CBM co-ordinator at CBM-NCBS, in a statement.

Also read: World Happiness Report 2026 Flags Social Media Harms On Adolescents' Mental Well-being

What Is CALM-Brain?

CALM-Brain is the result of collaborative efforts of researchers at the Rohini Nilekani Centre for Brain and Mind (CBM) — a partnership between the National Institute of Mental Health and Neuro Sciences (NIMHANS) and the National Centre for Biological Sciences (NCBS) - TIFR.

CALM-Brain is India’s first-of-its-kind repository of clinical, neuroimaging, behavioral, genetic, and other datasets on disorders such as:

• addiction,
• bipolar disorder,
• dementia,
• obsessive compulsive disorder (OCD)
• schizophrenia.

• Functional Magnetic Resonance Imaging (fMRI)
• Near Infrared Spectroscopy (NIRS)
• electroencephalogram (EEG)
• observations of cognition
• eye-tracking
• genetic analyses of blood samples
• clinical assessments.

The dataset is also linked to a biorepository of stem cells, which can be used to perform biological research in psychiatry to understand the origins of such severe mental illnesses.

“The primary goals of the project are to identify biological markers of severe psychiatric illnesses, which cut across traditional diagnostic frameworks. In addition, we will try to identify fundamental biological mechanisms of the disease and medication response,” said Prof. Y.C. Janardhan Reddy, CBM coordinator at CBM-NIMHANS.

Burden Of Mental Illnesses In India

Mental wellness is a major health and economic concern in India. The World Health Organization (WHO) estimates India’s economic loss due to mental health conditions to be USD 1.03 trillion (2012-2030).

Recently, health experts and policymakers, as part of the government-led Post-Budget Webinar series, highlighted the growing burden of mental and neurological disorders in India and also stressed the urgent need to strengthen institutional capacity to meet emerging healthcare demands.

"One in seven Indians is affected by mental health disorders, while several states continue to face a treatment gap ranging from 70 to 90 percent," the experts said.

They added that "neurological and mental health conditions are among the leading contributors to disability-adjusted life years (DALYs)" among citizens.

To address the rising burden, the government aims to launch NIMHANS-2 — first announced by Finance Minister Nirmala Sitharaman during the Union Budget 2026-27 — to deliver specialized care for mental health and neurological disorders in north India.

"In addition, the Central Institute of Psychiatry, Ranchi, and the Lokopriya Gopinath Bordoloi Regional Institute of Mental Health, Tezpur, will be upgraded as regional apex institutions to strengthen mental healthcare services in the eastern and north-eastern regions," FM Sitharaman said.