Calories: the facts

Calories! We hear about them every day: how many, is this low in calories,Calories: The Facts how many am I burning, how do I burn them, oh no that has too many calories! We try to avoid them like the plague! But do we really know what they are and what they do? Are they really that bad for you? Let’s take a good look at calories: the facts and see what it’s all about.

What is a calorie

A calorie is a unit of energy. Regarding nutrition, calories refer to the energy individuals get from the food and drink they consume, and the energy they use in physical activity.

There are two types of calorie:

  • A small calorie (cal) is the quantity of energy necessary to increase the temperature of 1 gram (g) of water by 1º Celsius (º C).
  • A large calorie (kcal) is the quantity of energy necessary to increase 1 kilogram (kg) of water by 1º C. It is also known as a kilocalorie.

1 kcal is equal to 1,000 cal.

The two terms large calorie and small calorie are often used interchangeably. This can be and often is misleading. The calorie break-down described on food labels refers to kilocalories. For example, a 300-calorie milk shake actually contains 300,000 calories.

When you hear that something contains a certain amount calories, it’s a way of describing how much energy your body could get from consuming it.

What do calories do

The human body needs calories (energy) to survive. Without energy, the cells in the body would simply die. The heart and lungs would stop, and therefore the organs wouldn’t be ready to perform the essential processes needed for living. Humans absorb this energy from the food and drink they consume.

If individuals consumed only the number of calories needed every day, they would probably have healthy lives. Calorie consumption that is too low or too high will eventually lead to health problems of one type or another. Balance is the key to all aspects of life—especially calories!

The number of calories in food tells us what quantity of probable energy they contain. It’s not only calories that are important, but also the essence from which the calories are taken.

Below are the caloric values of three main components of food:

Bottom line: it’s not the calories it’s what they measure-energy and we need energy. This is why we burn calories even when we do nothing. The automatic functions of our bodies require energy to function. However, the more activity we do, the more energy we need and the more calories we need to burn.

How many calories do we need

The US government states that the average man needs 2,700 kcal per day and the average woman needs 2,200 kcal per day.

However, not everybody needs the same number of calories each day. People have dissimilar metabolisms that consume energy at different rates, and some individuals have more energetic lifestyles than others.

The suggested consumption of calories per day depends on several factors, including:

  • height
  • weight
  • sex
  • body shape
  • overall general health
  • physical activity demands

Calories and weight gain

Calories don’t weigh much themselves, but like snowflakes, put enough of them together you have an issue. Excess calories are collected as potential energy, typically in the form of body fat. Small amounts are also stored in the liver and muscles as glycogen, a storage form of glucose used for short-term energy. This process if allowed to perpetuate can lead to obesity and other serious health issues.

To control weight gain, an individual needs to keep their caloric intake in line with the rate their body burns them.

If only it were that simple. Counting calories by itself doesn’t work because in the end it matters where those calories come from. This matters more than the number of calories consumed. The focus on the low-fat diet has caused some problems.

It is true that fat contains more calories than carbohydrates, including sugar. But that doesn’t mean that a sugary beverage is better for you than a handful of nuts. That’s just not what the studies have shown. Looking only at calories overlooks the metabolic effect of each calorie. In other words, the source of the calorie changes how an individual digests it and how one might retrieve energy from it.

Therefore, we can’t totally disregard fat. It just needs to be one of the healthy fats like avocado, olive oil, and nuts. So one should not cut out the fat, or make a habit of eating products labeled fat free.

At one time carbohydrates were categorized as simple or complex. But these classifications were misleading. Many doctors are off from those narrow categories and moving toward the all-encompassing terms of high glycemic index and low glycemic index. For example, an apple is a simple carbohydrate because it is digested quickly by the body, but fruit is better for you than other simple carbohydrates such as chips or crackers. That’s the glycemic index is viewed as a more accurate measure of a food’s value (good or bad). When something features a low glycemic index, it raises an individual’s blood glucose levels slowly, increasing the insulin levels gradually.

This is beneficial, because excessive insulin spikes result in insulin resistance, where the body stops responding to insulin it is producing (also known as type 2 diabetes). High-glycemic foods, on the other hand, cause Calories: The Factsblood sugar levels and thus insulin to rise quickly, prompting the overproduction of insulin and fat accumulation. It is best to focus on low-glycemic foods like wheat bread, fruits, whole-grain pasta, nuts and beans. High-glycemic foods include candy, croissants, and scones. *By choosing the low-glycemic foods and as well as the minimally processed foods, individuals can lose more weight, feel fuller for longer periods of time, and thus remain healthier.

Some additional low glycemic foods are:

  • 100% stone-ground whole wheat or pumpernickel bread.
  • Oatmeal (rolled or steel-cut), oat bran, muesli.
  • Converted rice, barley, bulgar.Calories: The Facts
  • Corn, yam, lima/butter beans, sweet potato, legumes, peas, and lentils.
  • Most fruits, non-starchy vegetables and carrots.


Some additional high glycemic foods are:

  • White bread (71)
  • White Rice (89)
  • Watermelon (72)
  • Honey (73)
  • Doughnuts (75)
  • French fries (76)
  • Cereals (76)
  • Millet (71)
  • Corn syrup (73)
  • Pumpkin (75)
  • Instant oatmeal (83)
  • Rice pasta (78)
  • Parsnips (97)
  • Table sugar (75)Calories: The Facts
  • Soda (74)
  • Cheerios (74)
  • Puffed rice (78)

Something to note: even as much as high glycemic index foods are dangerous for some people (e.g. diabetes), health experts also do not suggest an individual to completely eliminate all high GI foods from their diet. One can only work towards the goal of eating more of low and medium glycemic index alternatives of such foods.

Even though some foods could also be high in glycemic index, they’re also low in calories and highly nutritious concurrently. Therefore, one must not completely give up on such foods. A good example would be Watermelon. Learn more about whether or not to follow a low glycemic index diet here.

Beware of empty calories

Empty calories are the ones that supply energy but very little nutritional Calories: The Factsvalue. The elements of food that provide empty calories contain practically no dietary fiber, amino acids, antioxidants, dietary minerals, or vitamins.  These are known as unhealthy calories.

According to, a diet administration tool from the USDA, empty calories come mostly from solid fats and added sugars.

  • Solid fats: Although they subsist organically in many foods, they are often added during industrial food processing, as well as during the preparation of certain foods. Butter is an example of a solid fat.
  • Added sugars: These are sweeteners that are supplemented to foods and beverages in the course of industrial processing. They are filled with calories. In the U.S., the foremost forms of added sugars are sucrose and high-fructose corn syrup.

Added sugars and solid fats are commonly believed to make foods and drinks more enjoyable.

However, they additionally add many calories and are major contributors to obesity.

Because of this, fast food is an issue in the US. Researchers from the Centers for Disease Control and Prevention (CDC) printed a report in 2013 that showed 11.3 percent of calories consumed by people in the U.S. come from fast foods.  Nutritionists and healthcare professionals believe this percentage is too high.

As people age, they have a tendency to induce fewer of their daily calories from fast foods. Fast foods compose only 6 percent of the daily calorie intake of older adults.  They tend to have more stable schedules and more apt to prepare and eat meals at home.

However, with the amount of highly calorific meals served in restaurants or aimed toward younger individuals, it’s important that individuals pay close attention to where they get their calories.

Other sources of empty calories

The foods and drinks below provide the largest amounts of empty calories:

Solid fats and added sugars

  • cookies
  • ice cream
  • donuts
  • pastries
  • cakes

Solid fats

  • sausages
  • bacon
  • ribs
  • hot dogs
  • cheese
  • pizza

Added sugars

  • fruit drinks
  • sports drinks
  • energy drinks
  • soda

Sugary drinks are the primary supplier of empty calories for individuals in the U.S. More than half of the people within the U.S. have at least one sugary drink each day.

It is better to avoid them in general and as an alternative consume water, fat-free or 1 percent fat milk, one hundred percent fruit beverage, and low-sodium vegetable juices.

The intake of empty calories can be evaded or considerably curtailed by integrating fresh, healthy food and drink into the diet.

Please feel free to leave any question, comment or concern below.

Good Health!!




4 thoughts on “Calories: the facts”

  1. When I went to college to get my fitness specialist certification, I was always surprised by the number of students that really didn’t know the facts about calories and what they do.

    I’ve taught all-ages and all-body types and it really is true how subjective the rate we burn calories is.  Like you, I always go for a reasonable balance for caloric intake and, physical activity for that matter.

    It pains me when I see people drastically reduce their caloric intake and then beat themselves into the ground with their workouts.  Folks, that is counterproductive!  

    I really dug your snowflake analogy.  Now, every time I am tempted with empty calories, I’m going to look at it like it’s dirty snow!  I’m not perfect when it comes to my caloric intake but, I’ll always shoot for a decent balance. 

    1. Yes, Frye, balance is the key to life.  If we can maintain balance in most aspects of life, that equals success.  Thanks for commenting!

  2. Your guide is very awesome on Calories. While reading I know that a calorie is a unit of energy. Regarding nutrition, calories refer to the energy individuals get from the food and drink they consume, and the energy they use in physical activity. Without energy, the cells in the body would simply die.The automatic functions of our bodies require energy to function. Thanks for sharing.

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