Calories and macronutrients play an important part of any fitness goal, as they are required to fuel your body and nourish your muscles. So what are they? Which ones and how much should you be eating? I’ll start off going over what calories and macronutrients are, then give some tips to determine how much of each you need.
Calories are, scientifically, a unit of energy. In the nutrition sense, a calorie is the amount of energy you will get from food. Over the course of a day, you will burn a certain number of calories just for your body to survive, this is your Basal Metabolic Rate. This means that, even if you slept all day long, you still burn calories. Moving around and doing your daily activities will burn even more calories. So, you burn calories on a daily basis, and just like a fire, you need fuel to sustain this burn. That is where food comes in. The calories listed on nutrition labels are the estimated amount of calories you will gain from consuming that food. I say estimated because the amount is calculated in a lab, and the human body is more complicated than a controlled experiment. That being said, it’s still a good estimate to use the nutrition labels on food. The basic breakdown of how many calories you should eat is dependant on your goal. To lose weight you need to consume fewer calories than you burn. To maintain weight you should consume the same amount of calories that you burn. Similarly, to gain weight you need to consume more calories than you burn. Each person burns a different amount of calories depending on their metabolism, gender, age, weight, and other factors.
The calories in your food can be broken down into three macronutrients; carbohydrates, protein, and fat. The primary purpose of any macronutrient is to provide energy. The breakdown calories into grams for the macronutrients is as follows
Macronutrient (1g)
|
Calories
|
Carbohydrates
|
4
|
Protein
|
4
|
Fat
|
9
|
Let’s take a closer look at each macronutrient.
Carbohydrates bring to mind starchy food, like bread and potatoes; but they are actually defined as sugars. Aside from bread and potatoes, carbohydrates are also in fruit, milk, and anything sweetened. Carbohydrates are used for long term energy and for fueling your brain. Due to the use of carbohydrates throughout the day, a person should typically consume a lot of them. The recommended amount of carbohydrates in a person's diet is 45 - 64 % of total calories.
When you picture protein you will often think of meats, but nuts, beans, and dairy are also high in protein. Protein is used as the building blocks of our body and are broken down into amino acids for use in growth and repair. If you don’t have enough carbohydrates to fuel your day, protein will step in and be used to sustain you. It is not ideal to have your body run off of protein since it is needed elsewhere. The general recommendation for protein intake is 0.8g for every kilogram of body mass. This number will change depending on your fitness and dietary restrictions. For example, someone who is looking to build muscle and lifting a lot of weights may need as much as 1.7g for each kg of body mass.
Your required calorie intake will be unique. Work with a nutritionist to accurately determine your calorie intake and macronutrient amounts. The following two links can be used to get an idea of your calorie intake and macronutrient breakdown.
References
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