How To Figure Out How Many Calories To Lose Weight

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Nearly all packaged foods we eat have a nutritional label. The amount of calories on that label is a guiding factor in helping consumers make good or bad food choices. The problem is, calorie counts are not entirely accurate.

Scientists are learning that not all calories are created equal. The traditional method that we use to measure calories needs to be updated, according a session called “Re-examining the Energy Value of Food presented at the annual meeting of the Institute for Food Technologists on Sunday, July 14.

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The current system provides only an estimate of the energy content of foods, but determining the real caloric value of a food item requires actual feeding experiments, one speaker said.

At its most basic, a calorie is a measure of energy. One Calorie (equal to one kilocalorie, or 1, 000 calories) is the amount of energy that is required to heat one kilogram of water 1 degree Celsius at sea level.

The energy content of food was traditionally measured using a bomb calorimetry. A sample of food, for example a small piece of a hot dog, is placed into a metal vessel called a bomb. The bomb is filled with oxygen and placed inside a container where it is surrounded by water.

How To Calculate How Many Calories You Need To Eat To Lose Weight

Then, the sample is ignited by a current of electricity. The water chamber absorbs the heat that is released as the food sample burns. A thermometer measures the rise in temperature of the water.

Since a Calorie raises the temperature of 1 kilogram (1 liter) of water by 1 degree, the calorie count is found by calculating the change in temperature of the water multiplied by the volume of water.

In the 1800s chemist Wilbur O. Atwater determined the average number of calories in the three main sources of energy in food: fat, carbohydrates, and protein.

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The 4-9-4 Method or the Atwater system is how calorie values on food labels are determined today. For instance, a bag of crackers that has 5 grams of fat, 22 grams of carbohydrate, and 2 grams of protein should contain around 140 Calories.

The problem with the Atwater system is that not all the energy in foods is completely digested or absorbed. The Atwater system corrects for losses in energy in the form of urine or feces (the energy that isn't excreted is known as metabolizable energy), but it does not account for how absorption varies based on the type of food or the individual who is consuming it.

What does this mean for us? Even if two foods contain the same number of calories on the label, the number of calories that is actually absorbed by the body can vary with each person and the type of food.

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One example: nuts. In a study published in the Journal of Nutrition in 2008, U.S. Department of Agriculture researcher David Baer concluded that nuts are a food group for which substantial evidence suggests that the Atwater factors may be poorly predictive.

Bear found that whole almonds have about 20% less calories than the value calculated using Atwater factors.In a separate study, he found that pistachios had 5% less calories than originally thought.

This has to do with how nuts — especially whole nuts — are absorbed by the body. With whole nuts, compared to peanut butter or peanut oil, more fat ends up in the poop. People who eat more nuts also lose more fat in the stool.

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In nuts, a lot of the fat is stored inside the cells walls. So if the cells are not broken during chewing they may pass right through the gastrointestinal tract without releasing the oil they contain, Baer found.This article was co-authored by Claudia Carberry, RD, MS. Claudia Carberry is a Registered Dietitian specializing in kidney transplants and counseling patients for weight loss at the University of Arkansas for Medical Sciences. She is a member of the Arkansas Academy of Nutrition and Dietetics. Claudia received her MS in Nutrition from the University of Tennessee Knoxville in 2010.

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Counting calories is a useful strategy for losing weight. Since all packaged foods in the US must contain a nutrition facts label, this should be pretty easy to do. If you need to know the exact number of calories coming from fat, protein, and carbs, then you will have to do a little extra math. In cases where your food doesn't have a label, like at a restaurant, try looking up dishes or ingredients using an online food composition database or calorie calculator. After reading this article, you might want to calculate your total daily calorie needs.

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This article was co-authored by Claudia Carberry, RD, MS. Claudia Carberry is a Registered Dietitian specializing in kidney transplants and counseling patients for weight loss at the University of Arkansas for Medical Sciences. She is a member of the Arkansas Academy of Nutrition and Dietetics. Claudia received her MS in Nutrition from the University of Tennessee Knoxville in 2010. This article has been viewed 639, 789 times.

The content of this article is not intended to be a substitute for professional medical advice, examination, diagnosis, or treatment. You should always contact your doctor or other qualified healthcare professional before starting, changing, or stopping any kind of health treatment.

To calculate food calories, start by looking at how much protein, carbohydrates, and fat the food has. Then, multiply the total number of grams of protein by 4, since 1 gram of protein is equal to 4 calories. Do the same thing for the carbohydrates, since 1 gram of carbohydrates is equal to 4 calories. Next, multiply the total number of grams of fat by 9, since 1 gram of fat is equal to 9 calories. Finally, add up all 3 numbers to get the calorie count for 1 serving. To learn more from our Dietitian co-author, such as how to use a food calculator online to count calories, keep reading!However, if you don’t care about the caloric information of anything ever, then feel free to just breeze on by and come back for cookies later! But for us humans who want to know this monumental secret I will most likely be referring back to for a

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I cannot tell you how many questions/comments/emails/moderately panicked calls for help I get regarding this very topic. People (most often times very politely, so thank you) point out that my nutritional information is wrong, and that the actual stats are higher. It’s not wrong, folks. I just happen to know this little secret on how to correctly count calories, and I’m ready to let you all into the loop.

Ready? Okay. There’s this magical concept called a “net carb”, which is often used by people on diets such as Atkins or Paleo when carb counting, but it usually just ends there. I, on the other hand, have taken it a step further with the subsequent “net calorie. ”

First, some interesting/dorky background on biology and the composition of calories. The four major classifications of biological molecules are proteins, carbohydrates, lipids (fats), and nucleic acids (but we won’t be dealing with these today). You probably encounter the first three a lot in everyday life, especially on nutritional labels.

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The calories in food come from proteins, carbohydrates, and fats. A gram of protein has 4 calories, a gram of carbohydrate has 4 calories, and a gram of fat has 9 calories. With a bit of simple math, you can verify that on any food label. Sometimes there is a discrepancy, and I always honor the caloric product I got after I plugged in my formula.

Does it work? Grams of protein x 4 (16) + grams of carb x 4 (52) + grams of fat x 9 (18) = 86 calories! Sometimes there are actually fewer calories than stated because the company overcompensates. That’s very respectable of the company, and a happy accident for us consumers!

Let’s try it again: Grams of protein x 4 (8) + grams of carb x 4 (100) + grams of fat x 9 (9) = 117 calories. Hmm. That’s way off from the stated 60! Why is Fiber One allowed to say that? The FDA allows for a 20% discrepancy in food labeling, but this is much farther off than 20%. What gives?

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So back to biology, there are many different kinds of carbohydrate molecules, and saying that they ALL have 4 calories a gram is simply incorrect. One of the reasons celery is such a low calorie food is that it contains a significant amount of cellulose, a fibrous carbohydrate that is indigestible by the human body. Therefore, if