[watwut]

That would be old way of determining calories which is not used anymore. Also, the method of burning food in that specific test wont burn diamonds.

[chrisseaton]

That doesn't mean they aren't in there, just that you don't get them out using your experiment.

Which... is the whole point. Not all calories are equally accessible to digestion. That's the point in the first place. Of course a calorie is not just a calorie for the purposes of digestion. We know that, because we can't digest, for example, diamonds.

[watwut]

So, how do you address the other calorie counting method, the one that is actually used?

[chrisseaton]

That doesn’t mean they don’t contain energy!

But..... that's the point..... if you measure in different ways you get different energy released and so different calories measured.