Counting calories is a complicated business. Fat, carbs, protein, sweets - are all calories created equal, or are some better than others? Here's what the experts have to say.
The History of Calorie Counting
People haven't been counting calories forever (though some days it may feel as if you have). The idea became popular around the turn of the 20th century, according to Jonny Bowden, PhD, CNS, a board-certified nutritionist and author of Living the Low Carb Life: Choosing the Diet that's Right for You from Atkins to Zone, and The 150 Healthiest Foods on Earth: The Surprising, Unbiased Truth About What You Should Eat and Why. At that time, scientist Wilbur Atwater noticed that if you put food in a machine, called a "bomb calorimeter, " and burned it, you could measure the ash and heat to find out how much "energy" was released and therefore how much "energy" was in the food. The idea caught on, and people began counting calories - that is, calculating exactly how many calories were consumed when eating particular foods, and "burned" when engaging in different activities. "A spate of diet books in the early part of the century popularized the notion that it's all about the calories - and it's been with us ever since, " Bowden tells WebMD.
"As far as weight gain is concerned, a calorie is a calorie, " says Lisa R. Young, PhD, RD, author of But there are a myriad of reasons to base your food choices on criteria other than calorie content. For example, if the food you eat contains fiber, it will keep you feeling full longer, Young says, which can prevent you from reaching for "extra" calories in order to fill yourself up.
The benefit of choosing fruits, vegetables, and other lower-fat foods is that you get more bang for your buck, says Betsy Klein, RD, LD, a Miami-based dietitian. Carbohydrates and protein have 4 calories per gram, while fats have more than twice as much - an entire 9 calories per gram. (Alcohol weighs in at 7 calories per gram.) If you're counting calories to lose weight, but eating higher-fat foods like bacon and full-fat cheese, you could potentially consume over half your day's calorie allotment by the end of breakfast, she says. Choosing carbs and protein for your morning meal, on the other hand, like an egg white omelet stuffed with mushrooms, onions, green peppers, and a small amount of low-fat cheese, will leave you with calories to spare for meals and snacks beyond breakfast.