Like, water has no calories. But plants do? And some random elements have like billions of calories but if you just pick up a rock and eat it you won’t get any energy.
In: Biology
Easiest (and, incredibly, accurate from a chemistry perspective) is to ask yourself “can I burn it?” Not just char it, mind you, but set it on fire and get energy from burning it directly.
If burning it produces energy, it has calories. The bigger the fire, the more the calories.
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