01 September 2015, 06:29 PM ET
The percentage of U.S. college students who say they smoke marijuana daily or nearly every day is at its highest in more than three decades, according to a new survey.
01 September 2015, 03:20 PM ET
More U.S. adults, particularly those older than 45, are visiting the emergency room for bicycle-related injuries in recent years, according to a new study.
01 September 2015, 06:49 AM ET
When former U.S. President Jimmy Carter announced earlier this month that he had melanoma, he also took the opportunity to slam another health issue: the Guinea worm.
01 September 2015, 02:27 AM ET
The small intestine is about as big around as a middle finger, but it is about 22 feet (6.7 meters) long.
01 September 2015, 02:21 AM ET
Kidneys are bean-shaped organs located on both sides of the spine, behind the stomach. Their main purpose is to keep the composition of blood in the body balanced to maintain good health.
01 September 2015, 02:14 AM ET
The stomach is a bean-shaped sack located behind the lower ribs. It is the first stop in the digestive tract before food moves on to the small intestine.
01 September 2015, 02:08 AM ET
The esophagus is a tube that connects the throat (pharynx) and the stomach. Within it, muscles contract to move food to the stomach.
31 August 2015, 08:51 PM ET
Not getting enough sleep really does boost your risk of catching a cold, a new study suggests.
31 August 2015, 06:09 PM ET
By stacking up cells like Legos, scientists have found a new way to produce human tissues in the lab.
31 August 2015, 05:04 PM ET
A rare and fatal brain disorder called multiple system atrophy (MSA) may be caused by a newly discovered prion.
31 August 2015, 01:07 PM ET
The blind spot of the human eye can be shrunk with certain eye-training exercises, a small new study suggests.
31 August 2015, 08:25 AM ET
For a very small, but growing number of people, diminutive dwellings are making dreams come true.
31 August 2015, 01:39 AM ET
A new report advises parents to start talking to their children early about alcohol, in order to prevent dangerous consequences.
28 August 2015, 11:58 PM ET
The large intestine, also called the colon, is part of the final stages of digestion. It is a large tube that escorts waste from the body.
28 August 2015, 09:05 PM ET
There are many reasons why women and couples chose surrogates to be part of their fertility treatment.
28 August 2015, 01:33 PM ET
In a new study, 10 volunteers had lone star ticks feed on them for 15 minutes so researchers could closely examine the bites that these bugs cause.
28 August 2015, 12:35 PM ET
An update to the serving sizes listed on food labels will better reflect the amount of food people actually eat, the Food and Drug Administration (FDA) says. But determining an appropriate serving size may be trickier than you think.
28 August 2015, 12:17 PM ET
Smoking pot frequently may lower men's sperm counts, a new study finds.
28 August 2015, 08:04 AM ET
New mom and scientist Alice Callahan teaches other parents how to interpret studies on childrearing so that they can make informed decisions.
27 August 2015, 05:35 PM ET
Pop quiz: What exactly is a "serving size"? In a new study, just about 20 percent of people answered this question correctly, saying that serving size is how much people typically eat in one sitting.
27 August 2015, 04:15 PM ET
To better fight obesity and its related diseases, people should stop counting calories and instead focus on eating nutritious foods, several researchers argue in a new editorial.
27 August 2015, 03:27 PM ET
Predicting West Nile outbreaks may soon become as common as predicting the weather.
27 August 2015, 03:05 PM ET
Viruses related to the human immunodeficiency virus (HIV) have infected Old World monkeys as far back as 16 million years ago, according to a new study.
27 August 2015, 02:58 PM ET
Most infants and kindergartners in the United States are up-to-date with their vaccinations, but there are some areas where vaccination rates are lower, potentially increasing the risk of disease spread there.
27 August 2015, 02:25 PM ET
Meth lab injuries are on the rise in some parts of the U.S., according to a new report from the Centers for Disease Control and Prevention (CDC).
27 August 2015, 02:00 PM ET
A man in the United Kingdom experienced a very rare complication of the Polio vaccine he received in childhood.
27 August 2015, 01:07 AM ET
Broken genes wreak havoc, but new technologies may soon allow for precision repairs.
27 August 2015, 01:02 AM ET
Dietary fiber is a plant-based nutrient that is sometimes called roughage or bulk. Fiber is important to digestion and regularity, weight management, blood sugar regulation, cholesterol maintenance and more.
26 August 2015, 08:06 PM ET
Second-born siblings may argue that firstborns get all the glory, but there may be a health benefit to coming in second.
26 August 2015, 05:42 PM ET
Burger King is proposing a one-day truce with its fast-food competitor McDonald's to create the "McWhopper," a combination of the Big Mac and the Whopper. But just how many calories would this conglomeration have?
26 August 2015, 05:20 PM ET
Violent crime is complex, but America's dual obsession with guns and fame may explain the nation's high rates of mass shootings.
26 August 2015, 04:11 PM ET
The human circulatory system keeps blood, oxygen and nutrients flowing through the body.
26 August 2015, 12:03 PM ET
An epigenetic switch may explain the hormone cascade that kicks off labor, offering hope for the prevention of preterm births.
26 August 2015, 11:00 AM ET
Some people who smoke pot do show changes in brain development, but those changes seem to be dependent on genes and other factors.
25 August 2015, 07:34 PM ET
Carbohydrates — one of the basic food groups — are the sugars, starches and fibers found in fruits, grains, vegetables and milk products. They are important to a healthy life.
25 August 2015, 07:21 PM ET
Vitamin A is good for healthy vision, skin, bones and other tissues in the body. Vitamin A often works as an antioxidant, fighting cell damage, but it also has many other uses.