20/12/2025
Are all calories equal?
On paper, yes. In your body, not even close.
A calorie is just a unit of energy, but your body is not a calculator. It’s a digestive system, a hormone system, a metabolism, and a brain, all responding differently depending on what you eat.
This is where caloric availability comes in.
Caloric availability is the number of calories your body actually absorbs and can use, not the number on the label. Two meals with the same calories can lead to completely different levels of fullness, energy, and fat loss because digestion, protein, fibre, and food structure all change how many calories your body ends up with.
That’s why whole foods feel different to ultra processed foods. That’s why protein keeps you fuller. That’s why some calorie deficits feel easier than others.
Calories in calories out still matters. Always has.
But you can make your food work harder for you.
This isn’t about banning foods or being perfect.
It’s about knowing when certain foods work for you and when they don’t.
For a much deeper and more practical breakdown of this, I’ve written a full blog explaining caloric availability, digestion, fibre, protein, and real world examples.
👉 Go to https://www.simongpt.co.uk/are-all-calories-equal/