WHAT IS ENERGY ?
AND WHAT ARE ENERGY FOODS ?
When you perform any kind of movement or exercise your body will use energy, you can’t see or touch energy in your body but you can feel it in the form of heat. For example like a car burns petrol to move, our bodies will burn food to move, the heat you make is the end result of a biochemical reaction that starts as soon as you ingest food. Scientists measure the amount of heat produced by food in kilocalories. So what is a Kilocalorie, kilojoule or calorie?
KILOCALORIE: a kilocalorie is the amount of food energy it takes to raise the temperature of one kilogram of water by one degree centigrade they do this by burning the food in a bomb calorimeter.
A CALORIE: a calorie is a unit of measurement our body can get from food, but a calorie is a very small unit of food energy. An average portion of food will contain thousands of calories, as a calorie is 1/1000 of a kilocalorie. So one kilocalorie is equal to 1000 calories.
KILOJOULE:a kilojoule is the SI unit for energy which is the international unit system. One joule is the work required to exert a force of one Newton for a distance of one metre, one kilocalorie is equivalent to 4.18 kilojoules.
As you might of noticed a calorie is 1/1000 of a kilocalorie, but when you talk about food and energy or food energy you use the term calorie If you wanted to be really accurate you would use the term kilocalorie but as it is common to, and easier to, use the term calorie That’s what I will do within this site.
Energy in food comes from protein, carbohydrates and fat. Carbohydrates are the main source of energy your body uses, then protein and fats if there is not a sufficient supply of carbs. Each of these macronutrients supplies a different amount of energy.
1 gram of
Carbohydrates = 4 calories
Protein = 4 calories
Fats = 9 calories
Alcohol = 7 calories.
The macronutrients in your food are broken down by enzymes in your body into smaller molecules, absorbed and then transported in through your bloodstream to the cells in your body, the nutrients are then converted to ATP 'adenosine triphosphate' ATP consists of adenosine and 3 phosphate groups attached, when one of these phosphate groups’ brakes off then energy is produced.
This energy fuels work like muscular movement. Only about a quarter of the energy produced this way is used as muscular movement the rest is given of as heat. Your body has enough ATP for only few seconds of fuel for exercise, after this your body will break down glucose to make more ATP, so more energy.
There is only one problem with the chemical reaction of being able to produce energy from glucose it will produce a by product called lactic-acid, too much of this and your muscles will start to ache. Ever been in the gym and doing say the bench press when you have a light weight on the bar and you do a quite a few reps your muscles start to burn and ache and that is the build up of lactic acid in your body.