We all know that drinking water is good for us. If you are feeling tired, have some water. Have a dry skin? Have some water. Have a dry throat? Have some water. It is almost like water is the fix to all our issues. May be it is, but not always. So, are we sometimes drinking more water than necessary? What happens then?

Many say that there is an 8x8 rule one must follow when it comes to drinking water.

What is the 8x8 drinking water rule?

Many believe that in the 8x8 rule, eight 240ml glasses of water per day adds up to almost 2 liters. However, it is not in the guidelines in both the UK and the EU health advisory. None of them recommends this specific amount.

So, where did it origin from?

The origins of this rule seem to come from misinterpreted advice given decades ago. In 1945, a US advisory board suggested adults should consume one milliliter of fluid per calorie of food, totaling about two liters for women and 2.5 liters for men. Importantly, this included all drinks and even water-rich foods like fruits and vegetables.

A later book in 1974 recommended six to eight glasses of water daily but also noted that coffee, tea, and even beer could count towards hydration. Yet, the idea of drinking two liters of plain water daily took hold and has persisted ever since.

How Much Water Do We Really Need?

As per experts, drinking 8 glasses of water a day may be unnecessary and the research estimates that the actual requirement is around 1.5 to 1.8 liters per day. This not only includes water, but all kinds of fluids from all sources that we may consume in a day.

Also, studies show that instead of following a rigid routine, what is best is to focus on factors like temperature, physical activity and health conditions for your water intake. Those in hot and humid climate, high altitudes or pregnant or breastfeeding, and athletes may require more water. Whereas those in cooler areas, with a more sedentary lifestyle won't. However, for the average person, thirst is a more reliable guide than any fixed rule.

ALSO READ: What Happens When You Drink Too Much Water?

Science of Hydration and Dangers Of Over hydration:

Water is necessary to transport nutrients, control temperature, and keep organs functioning. We lose water through sweat, urine, and respiration, so staying hydrated is critical. However, dehydration develops only when the body loses 1-2% of its total water content.

A widespread myth is that feeling thirsty indicates that you are already severely dehydrated. Experts argue that thirst is an excellent evolutionary mechanism that ensures us drink when we need to. The body also produces hormones that aid in water conservation when necessary.

Drinking More Water Than Needed:

While drinking too much water is generally harmless, it can cause hyponatremia, a condition in which salt levels in the blood become dangerously low. This can result in brain enlargement, disorientation, convulsions, and, in extreme cases, death.

There have been reports of athletes overhydrating during endurance races, resulting in significant difficulties. Experts caution that simply following hydration myths might be dangerous, stating that thirst remains the greatest signal of when to drink.

The consumption of energy drinks among teenagers has increased in the US. This has sparked concerns among doctors about caffeine toxicity, sleep, heart health, and the effects on their developing brains.

According to the latest federally funded Monitoring the Future survey, 23% of 12th graders said they consumed energy drinks daily. The figure was 20% among 10th graders and 18% among eighth graders.

The findings come as a group of doctors have raised concerns about the growing consumption of energy drinks among young people, particularly after Monster Energy signed a sponsorship deal with the Big 12 Conference, a major US college sports organisation.

The deal puts Monster branding on football and basketball jerseys, fields, courts and digital and social media platforms. Doctors have urged the conference to pause the partnership and called for greater scrutiny of energy drink marketing to young people.

Doctors Are Concerned About Growing Energy Drinks' Consumption Among Teens

Also read: Exclusive: From IPL To Olympics — How Sport Became A Marketing Tool For Junk Food And Sugary Drinks

Dr. Robin Ireland told HealthandMe how marketing unhealthy foods and drinks through sports affects children.

He said, " Sport presents glamour and excitement, and children look up to big performers and superstars who often promote products they probably don't consume themselves because they're not good for sporting performance. Yet their names and images are used to create that excitement and, as you described, a health halo. Brands want to be associated with that healthy image. Athletes think that if they want to perform like a Sachin Tendulkar or another superstar, they need a sports drink or energy drink. And of course, they don't. But that's what the brands are trying to do."

Doctors involved in the campaign say their concern extends beyond Monster and applies to energy drinks as a category.

Dr Matthew Nelson, an Idaho cardiologist told US News, “Kids are going to see energy drinks now promoted by the universities and the athletes that they admire and want to emulate. The kids will think of them as sports drinks, which they’re not.”

Energy drinks can contain large amounts of caffeine. Depending on the product, a single serving can contain 80 to 300 milligrams of caffeine. An eight-ounce coffee typically contains around 80 to 100 mg, while some soft drinks contain 50 mg or less.

The American Academy of Pediatrics recommends that children and teenagers avoid energy drinks and advises those aged 12 to 18 to limit caffeine to no more than 100 mg a day.

Too much caffeine can increase heart rate and blood pressure and may cause sleep problems, agitation, and dehydration. In more severe cases, excessive stimulant intake can contribute to abnormal heart rhythms and seizures.

Dr Tamara Hannon, an Indiana paediatrician and chair of the American Academy of Pediatrics' nutrition committee, described the effect of excessive stimulants on the body.

She said, “The same thing can happen when you deliver stimulants to people. The heart can wear out, the nervous system can go haywire and you can have really serious consequences.”

Monster Energy, meanwhile, has defended its products, saying caffeine and other ingredients in its drinks are also found in many other foods and beverages.

The company said, “Mainstream energy drinks have been marketed worldwide for more than 30 years and more than 100 billion energy drinks have been sold and safely consumed globally.”

The company also said its products carry warnings and that its members do not sell or market energy drinks in K-12 schools.

Also read: Red Bull Vs FSSAI: Beverage Giant Can Retain The 'Energy Drink' Label; What Are Its Health Risks

Teen's Death After Drinking An Energy Drink

In 2017, 16-year-old Davis Cripe of South Carolina died after developing an abnormal heart rhythm following consumption of an energy drink. According to his father, Sean Cripe, Davis had consumed a Mountain Dew and a latte from McDonald's earlier that day before drinking the energy drink. He did not have a known heart condition and was not a regular energy-drink consumer.

“He chugged an energy drink — like, just trying to be cool,” Sean Cripe said. His father later said, “We had talked to him and let him know that they weren’t healthy. We didn’t understand they could be deadly.”

Doctors stress that deaths associated with energy drinks are rare, and Davis' case does not mean every teenager who consumes an energy drink will experience a life-threatening complication. But it illustrates why excessive caffeine consumption can be concerning in young people.

Message For Parents

Teenagers may consume caffeine from several sources in the same day, including energy drinks, coffee, soda and other caffeinated beverages. That can make it difficult to recognise how much caffeine they are actually consuming.

Doctors recommend that parents talk to teenagers about the difference between energy drinks and sports drinks and pay attention to all sources of caffeine in their diets.

The US Centers for Disease Control and Prevention also recommends educating children about the harms of excessive caffeine consumption.

Walk through a grocery store today and even chips and pastries come in "protein-boosted" versions. Nutrition experts at Stanford Medicine say this trend, often called "protein-maxxing," has outrun the science behind it.

The real picture is more nuanced. Some people do need more protein than official guidelines once suggested, but for most, the bigger problem lies elsewhere in the diet, not in a shortage of protein. Here's what the research actually shows.

1. Your body does need protein

Protein is one of three macronutrients, along with carbs and fat, and your body can't skip it. Dietary protein breaks down into amino acids, the building blocks used to make your own body's proteins.

"Protein can take the form of your muscles, your hair, your skin, everything has protein in it," said Jonathan Long, an associate professor of pathology at Stanford. Of the 20 amino acids your body needs, nine can only come from food.

2. The official recommendation just changed, and the old number was debated for decades

Until early 2026, the US RDA for protein was 0.8 grams per kilogram of body weight, a figure that had stood for over 80 years, according to nutrition writer Shannon Keefe.

New federal dietary guidelines released in January 2026 raised that to 1.2 to 1.6 grams per kilogram. For a 150-pound adult, that moves the daily target from about 55 grams, roughly an 8-ounce steak, up to 80-110 grams.

Also Read: New Experimental Drug May Preserve Muscle Mass During Weight Loss From Ozempic

Whether this matters for you depends on who you are. Christopher Gardner, Stanford's director of nutrition studies, says the old RDA already covers most healthy adults.

But other experts interviewed by Today's Dietitian, including sports dietitian Angie Asche, argue the 0.8g figure is too low for people trying to build muscle, adults over 65, and anyone on a weight-loss diet. The gap is partly because the original RDA was built on decades-old nitrogen-balance studies that may underestimate real needs, Keefe writes.

3. Protein matters most when you're cutting calories

Stanford Medicine notes protein becomes more important specifically when someone eats fewer calories, since a calorie deficit raises the risk of losing muscle along with fat.

This is especially relevant now, given rising use of weight-loss medications. Outside a calorie deficit, piling on extra protein doesn't offer the same payoff.

4. Fiber is the real gap in most diets

While protein gets the spotlight, fiber doesn't. Gardner points out that antioxidants which lower inflammation and help prevent cancer "don't come in meat and cheese and protein bars," per Stanford Medicine.

Only 5% of Americans meet recommended fiber intake, despite its role in gut and heart health. Beans, legumes and whole grains deliver both fiber and protein, but Americans eat less than 10 grams of legumes a day on average, Gardner says.

5. "Incomplete protein" is a myth

The old claim that plant proteins are 'incomplete' and must be paired with specific grains doesn't hold up, Gardner says. Plant proteins contain all 20 amino acids. Legumes run only slightly lower in one of them. Gardner co-authored a 2019 paper comparing amino acid profiles across animal and plant foods and found them nearly identical.

Other myths don't hold up either. There's no need to spread protein evenly across meals, says Stanford dietitian Marily Oppezzo, though older adults may need more per meal to trigger muscle growth. The post-workout 'anabolic window' is also longer than assumed, closer to 24 hours, so a protein shake right after the gym isn't essential.

More isn't automatically better. "I don't think a high-protein diet is necessarily bad, but what are you not eating?" Oppezzo asked. Chasing protein can crowd out the fiber, vitamins and antioxidants in vegetables, fruits, whole grains and nuts.

A compound your body makes after eating pomegranates, walnuts and some berries has improved heart function by up to 80% in lab models of a form of heart failure that's notoriously hard to treat. The finding comes from King's College London, and it's early, but it points at a problem doctors have struggled with for years.

The Condition With Few Treatments

The heart failure in question is called heart failure with preserved ejection fraction, or HFpEF. Here, the heart still pumps blood normally, but becomes too stiff to relax and fill properly between beats. It causes breathlessness, fatigue and a poorer quality of life, and accounts for roughly half of all heart failure cases in the UK, affecting nearly half a million people, according to King's College London's release, carried by ScienceDaily.

HFpEF has long resisted treatment because it's driven by many overlapping factors, including ageing, high blood pressure and diabetes, King's College London says. One class of diabetes drugs, called SGLT2 inhibitors, has recently changed that picture. Large trials named EMPEROR-Preserved and DELIVER found that the drugs empagliflozin and dapagliflozin cut deaths and hospital visits in HFpEF patients, and empagliflozin became the first SGLT2 inhibitor approved in the US specifically for HFpEF, according to TCTMD. But researchers still call the field wide open.

Also Read: Heart Valve Clips Explained: How a Tiny Clip Can Help Repair a Leaking Valve

What The New Study Found

Researchers led by Dr. Joseph Burgoyne found that a compound called urolithin A activates a protein named PKGIα, which helps blood vessels and heart muscle relax, King's says. In animal models of HFpEF, urolithin A improved heart function measures by as much as 80%, helped heart tissue relax better, and reduced fibrosis, the scarring that interferes with normal heart function. It also limited harmful enlargement of heart muscle cells.

The team then tested the compound in engineered human heart tissue grown from stem cells, a lab model that closely mimics real heart muscle. Urolithin A significantly improved relaxation there too, according to King's, suggesting the animal results might carry over to humans.

Notably, urolithin A has already been studied in people and has shown a good safety record, King's says. But your body doesn't get it directly from food. Instead, gut bacteria produce it by fermenting compounds found in pomegranates, walnuts and berries, according to the Global Prebiotic Association, a nutrition industry group. That means how much urolithin A a person makes can depend on which gut bacteria they have, not just what they eat.

Not A Reason To Stock Up On Pomegranates Yet

Burgoyne was careful about what the findings mean. "While there isn't enough evidence to suggest that people should eat pomegranates to treat heart failure, these findings raise the possibility that dietary approaches that enhance urolithin A production may help alleviate this condition," he said, per King's.

Professor James Leiper of the British Heart Foundation, which funded the study, struck the same note: "These findings are promising, but the benefits have so far been seen in animals and engineered human tissue, so clinical trials involving people are needed." He added that a healthy, balanced diet is still one of the best ways to protect the heart, but "no single food can prevent or treat heart disease on its own."