A calorie is a unit of heat.
Humans are not furnaces.
The calorie numbers on food labels come from burning food in a machine called a bomb calorimeter.
Your body does not burn food that way.
It digests, absorbs, stores, repairs, builds tissue, makes hormones, feeds microbes, regulates appetite, and adapts to its environment.
100 calories of steak and 100 calories of soda are the same in a laboratory.
They are not the same inside a human being.
One provides amino acids, minerals, and satiety.
The other is gone quickly and often leaves you looking for more food.
The calorie tells you how much heat a food can produce.
It does not tell you how hungry you’ll be an hour later.
It does not tell you what happens to your hormones.
It does not tell you how much energy you’ll actually use.
And it definitely does not tell you the nutritional value of the food.
We do not eat calories.
We eat food.