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> could never INCREASE the calories available?

It wouldn't add calories, but it would make more calories available in the sense that your body is able to extract them.

For instance, cooking food makes more calories bio-available.

What do you mean by "available"?

Fire was an important technology because it allows us to predigest food, getting more out of eating the same amount of stuff. This certainly does increase the calories available in the ordinary usage of the phrase -- but so does the blender example.

A blender is a bunch of knives. Just something else enabled by fire.

Basically. It's similar to how we typically process meat without adding anything to it before eating it, to make it easier to digest and to increase the available calories.

The way we process it is by cooking it.

No, blending it increases the calories available to easily absorb. This is partly why juicers are unhealthy.