• Steven Shuster, MS, CISSN

Nutrition Basics: The Macronutrients

Macronutrients are the components of food from which we get energy: protein, carbohydrate, and fat. They are called that because we consume them in relatively large quantities, grams, tens of grams, and sometimes hundreds of grams a day. Alcohol also provides calories, but it is not (hopefully) a nutrient from which you are deriving a large percentage of your calories each day. We will talk about alcohol at some point in the future. CC0 Public Domain

The macronutrients provide us with energy. In nutrition, the unit of energy is the calorie. The calorie is defined as the amount of energy it takes to raise 1 gram of water 1ºC. But this is where it gets interesting: in nutrition, we do not usually talk about the calorie; we talk about the Calorie.


One Calorie is equal to the energy it takes to raise 1 kilogram (1000 grams or 2.2 pounds) of water 1ºC. So, one Calorie is equal to 1000 calories. Often it is abbreviated to Cal or kcal. Sometimes notation can be confusing.

Fortunately, whenever someone is talking about Calories in food, they are referring to the big ‘C’ Calorie. The details are not very important, but the concept is: it takes a lot of energy to run your body.

The Calories that you get from food are responsible for maintaining your body temperature, performing the metabolic reactions that keep you alive, and for your activity, to name a few things.

Besides providing the energy that you need to stay alive and do the things that you want to do on a daily basis, each macronutrient has other functions: they can affect hormones, transport vitamins, be structural components of cells and organs, protect and insulate the body, etc. We’ll talk about each macronutrient and its functions in upcoming posts.

5 views0 comments

Recent Posts

See All

The gut microbiome does a lot of good things for us and is essential for our health. We are going to focus on the beneficial bacteria that are found in the large intestine. The large intestine is so n

TL;DR The gut microbiome is mostly made up of bacteria. There are loads of bacteria throughout our GI tract and they affect our health in a variety of ways. Variation in the gut microbiome is evident

Born out of my own restlessness, depression, anxiety and wanting to know the truth - The Experimental Body is a journey of self-discovery and true transformation. It will answer the question, "What h