Explore the complex relationship between calories and weight

Weight loss lessons from 'The Biggest Loser' contestants

This article dives into findings from studies conducted on contestants of "The Biggest Loser" that look at the correlation between weight loss, weight gain, metabolism, and physical activity. The studies support the theory of metabolic adaptation,...

Is metabolism related to weight loss?

Read this article to better understand metabolism and why doctors say it's only one piece in the puzzle to managing weight. Metabolism breaks down and converts what we consume into energy, which provides fuel for all of our body's functions—both...

History's weirdest weight loss fads, fact-checked

Nothing catches popular attention more than a claim to have found a quick weight-loss technique. History shows us such claims are often unfounded. Dr. Michael Mosley explores extreme weight-loss tips from history, from tapeworms to vinegar diets.

How meal timing factors into health outcomes

The world is trending toward weight gain, a development that comes with a corresponding rise in risk for health conditions, including diabetes and heart disease. This article explores how meal timing has become a factor in nutrition and weight maintenance.

What is a calorie?

Today it may go without thinking that we measure food by calories...but where did this come from and what does it mean? A kilo-calorie (or, as we call it, simply "calorie") is the amount of heat energy needed to raise the temperature of one...

Counting calories with a ballerina

Ballet dancer Theresa Farrell meticulously manages her diet to achieve her performance weight goal for the American Contemporary Ballet season in Los Angeles. She tracks calories, relies on pre-packaged meals, and calculates every intake. This regimen allows her to stay focused on training and rigorous dance routines, ensuring she's prepared physically for performances. Watch a day in the life here.

The evolution of the human diet

Could eating like our ancestors make us healthier? One estimate suggests prehistoric hunter-gatherer communities obtained 75% of their calories from meat and fish.

Artificial sweeteners aren't very helpful for weight loss

Research published in 2014 from a randomized controlled study found that, on average, people only lost about two pounds if they switched to consuming artificial sweeteners instead of sugar. Some individuals using artificial sweeteners also have gained weight. Scientists theorize one potential explanation for this is that the sweeteners alter gut microbiomes in ways that reduce beneficial flora that would help promote digestion.

The potential for weight loss drugs to transform the economy

In 2023, Americans spent more than $50B on weight loss drugs, a number expected to triple by the end of the decade. However, because of the wide range of obesity-linked health issues, widespread adoption of the treatments could transform the wider economy.

A caffeine calculator

This simple calculator takes your preferred caffeinated drink and your body weight to determine how much is the right amount, and how much might kill you. In case you've ever had the morbid curiosity about just how much of that tea you'd have to drink to doze off forever. Find out your moderate and lethal doses here, as well as some extra info on caffeine consumption.

Activity trackers promise to improve health by forcing us to examine the facts

Explore how modern fitness culture, rooted in capitalist ideals of productivity and control, shapes our perception of health and self-worth. The author blends cultural criticism with personal insight to examine the contradictions of the wellness industry, the rise of wearable tech, and what it means to "optimize" a body.

The economics of all-you-can-eat buffets

Is it possible to out-eat the price you pay for a buffet? How do these places make money? We looked at the dollars and cents behind the meat and potatoes.

Use the MyPlate widget to create your own meal plan

Enter your gender, age, weight, height, and activity level into the USDA's MyPlate widget for a personalized meal plan designed to be easy to understand. After viewing about how many calories are recommended to maintain your current weight, users...

Ultra-processed foods are made to maximize cravings and encourage overeating

Often disguised as healthy options like granola bars and low-fat yogurt, these foods silently fuel chronic diseases, despite dominating diets. Reviewing labels for ingredients like stabilizers and emulsifiers can serve as indicators to help identify these products.

Search this citation-heavy database of nutrition and supplement research

Explore a reference site that aggregates and summarizes peer-reviewed studies on hundreds of supplements and dietary interventions. It is ad-free and funded by subscriptions, making it a health resource without a financial stake in what you buy.

Moving your body every day is key to longevity

In an era of biohacking, where millionaires subject themselves to draconian routines and tests to de-age themselves, one study suggests a super simple key predictor of mortality: more than any other trait, how much subjects moved determined how long they'd live. Movement mattered even more than age in predicting overall life longevity. Researchers suggest this means we should all simply get outside a bit more. Read more about the study here.

Runners typically burn 2,600 calories during a marathon

They also burn between 5-10 pounds of water weight, often feel more focused and elated (thanks to increased neurotransmitters), and, oddly enough, temporarily grow about a half-inch shorter due to back muscles tensing.

Learn how your body is, scientifically, like a firework with its own slow, controlled burn.

Visualizing the world's food supply chains

The world's food supply chain is complex and lopsided, with much of the world's nutrient-rich food ending up in Europe and North America. This visualization illustrates the paths our food takes around the world, from starchy vegetables in...

Studies suggest when you sleep is as important as how much you get, and syncing with your circadian rhythms may lead to less fatigue and improved long-term health outcomes

Americans consume 8.3 billion calories of turkey on Thanksgiving

Individuals consume an average of 3,150 to 4,500 calories at the meal, which takes the average male 10 hours to burn off.

Watch how algorithms can be designed to train themselves and self-improve without human input, to the point where the optimized code is too complex for programmers to understand.

During the first Biosphere 2 mission, crew members lost 16% of their body weight

Food and oxygen shortages drove the “Biospherians” to split into two factions—one seeking to bring in outside resources and another aiming to maintain isolation for the experiment’s integrity. Psychological stress was exacerbated further by the increasing prevalence of insect pests.

The world's different calendars, explained

The calendar we use to mark the days, months, and year can feel set in stone, but the history of calendars shows these organization systems can and do change. Parse the fascinating, complex details of the Gregorian, Julian, Chinese, Hebrew, and many more calendars in this comprehensive, well-executed explainer video.

Use this tool to calculate the dollar value of your parental mental load, from meal planning to coordinating after-school care, then see resources that help generate solutions.

How epigenetics blurs the line between nature and nurture

An exploration of the study of how behaviors and environment affect the way genes work — and how that complicates the nature-versus-nurture debate.

Explore a simulation of the greenhouse effect

Investigate how cloud cover, surface albedo—a measure of a surface's reflectiveness—greenhouse concentrations, and atmospheric layers affect the energy balance on a simulated planet. Using either the wave or particle models of light, users can also explore how changes in solar intensity affect planetary surface temperature.

Watch how algorithms can be designed to train themselves and self-improve without human input, to the point where the optimized code is too complex for programmers to understand.

Breaking down the knee's anatomy

The human knee is a remarkably complex structure carrying the full weight of the body throughout a person’s life while allowing a number of complex twists, flexes, and extensions. It's also one of the body's biggest weaknesses—the location of chronic pain and replacement surgeries for millions of Americans.

Larger animals like giraffes, elephants, and blue whales have developed a unique defense against cancer, a phenomenon known as Peto's Paradox

Read a deep dive on the 'all-purpose healing' peptide BPC-157.

Telehealth demand for GLP-1s for weight loss is booming as consumers seek easier access.

Explore chaos in this simulation of two double pendulums, where small differences in the release angles produce wildly different outcomes.

Listen to an in-depth conversation on the links between Parkinson's disease and herbicide exposure and the challenging pace of scientific investigation.

Netflix profits when you're not watching, and its movies are designed that way—read a detail-rich critical essay exposing lesser-known Netflix takes

Hookworm infection, though risky, may help fight certain autoimmune conditions by tamping down the immune system's inflammatory response.

At the beginning of the 20th century, a group of young men ate standard American food—replete with food additives like borax and formaldehyde—as part of government research to better understand food safety.

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

20,000 letters to the advice columnist 'Dear Abby' provide insight into prevailing sex, religion, and LGBTQ fears, anxieties, and concerns from the 1950s onward.

Recent research found that the brain doesn't seem to massively rewire following amputation—upending earlier beliefs about the cause of phantom limb pain.

How Amazon operates a 'flywheel' business model, a self-reinforcing cycle that drives continuous growth

According to the physics of black holes, our 4D reality may be a hologram—a projection of information coded on a 2D surface on the edge of the universe.

Learn how to read a prospectus, the juicy document that any company must file with the SEC before going public.

The Mona Lisa's celebrity status and repeated restorations have obscured what made the painting so revolutionary for its time

The price of gas is a composite made up of several different factors, with the federal gas tax making up less than 20% of what drivers pay at the pump.

Explore a list of the 100 best novels of all time, compiled by some of the world's best living writers, including Salman Rushdie, Stephen King, and Jennifer Egan.

The boiling temperature of water decreases with increasing elevation because the molecules need less energy to overcome the lower atmospheric pressure associated with thinner air.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

Track the location of the Voyager probes, currently between 13 and 15 billion miles away from Earth.

The first steps to rebuilding your credit score include getting to know exactly what's on your credit report and figuring out how far you are from the '700 club,' or 'good score' range.