At any given time, millions of people in the U.S. are trying to lose weight. They spend billions of dollars each year on weight-loss products and services. Learn more about diets and weight loss by taking this quiz.
Dietary Fiber Quiz
You hear a lot about fiber and why you need it. But what is it? Learn more about this important part of your diet by taking this quiz.
Dietary Guidelines Quiz
Find out how much you know about the newest dietary guidelines and how they differ from the old food pyramid.
Dietary Supplement Quiz
Many Americans take vitamins, minerals, or other dietary supplements every day without knowing enough to ensure optimum results.
Digestive System Quiz
What happens to that cheeseburger and fries you had for lunch? During the digestive process, food is converted into energy that's used by your body. Take this quiz to see how much you know about how digestion works.
Disease Prevention Quiz
Answer this one: Which is the most important hygiene habit to teach young children? Learn the answer to this and other prevention questions by taking this multiple choice quiz.
Doctor-Patient Communication Quiz
Your doctor can't give you the best care if you don't say what's really going on. This true-false quiz will help you prepare for your next visit.
Drinking Water Quiz
When you're thirsty for a drink of water, you probably turn on the tap, or open a container of bottled water.
You may take for granted the quality of the water you drink. but water safety can vary from place to place. Find out more about drinking water by taking this quiz, based on information from the U.S. Environmental Protection Agency.
Drug Abuse Quiz
Drug abuse and addiction can break apart families, ruin personal relationships, and make it difficult to keep a job.
Drug Interaction Quiz
True or false: A drug-alcohol interaction can lead to extreme drowsiness and other effects. Do you know the answer to this and other questions about drug interaction?