Keith Ayoob answers the question: 'What are Calories, Why Do They Matter?' February 1, 2009 -- Question: What is a calorie and why is it important to know how many calories there are in certain foods?

This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. There’s some truth to the saying ”calories in, calories out” when talking about weight management. However, not all calories are ...

Calories aren’t always obvious. A plate that looks huge might be surprisingly light, while a smaller serving can carry more energy than you’d expect. Put side by side, 1,000 calories of different ...

While many protein-rich foods are relatively low in calories, some foods, like shrimp, lentils, and chicken breast, deliver significantly more protein per serving than others.

Add Yahoo as a preferred source to see more of our stories on Google. Fitness apps make it easy to track the number of calories in a meal. d3sign/Moment via Getty Images Knowing the calorie content of ...

Stop wasting calories on low-impact fuel. Learn how to strategically select the most protein-dense whole foods to torch fat, ...

Long held up as the big benchmark of nutrition, the calorie is losing its clout in the age of GLP-1s and a sharper focus on nutrients. Long held up as the big benchmark of nutrition, the calorie is ...