Can you ELI5 why water has no calories, which is also a unit of energy?
Calories are a very specific type of measuring energy, especially when used in the context of nutrition. When nutritionists say that water has 0 calories, they mean that water has no nutritional energy.
But when looking at it from a non-nutrition perspective water has calories.
When you say, “something has X calories”, it’s a shorthand of saying “something has an equivalent of X times the amount of energy that is needed to raise the temperature of 1 gram of water by 1°C.”
From a physical point of view water ALWAYS has energy (that you can express in calories) because something with mass can never have no energy.
It has. If it has mass, it has energy, that is a core principle of how matter is defined scientifically.
Can you ELI5 why water has no calories, which is also a unit of energy? Do we just not absorb it?
Calories are a very specific type of measuring energy, especially when used in the context of nutrition. When nutritionists say that water has 0 calories, they mean that water has no nutritional energy.
But when looking at it from a non-nutrition perspective water has calories.
When you say, “something has X calories”, it’s a shorthand of saying “something has an equivalent of X times the amount of energy that is needed to raise the temperature of 1 gram of water by 1°C.”
From a physical point of view water ALWAYS has energy (that you can express in calories) because something with mass can never have no energy.
Yes, your body doesn’t have a means to break down water and extract energy from it