Black coffee, if you don't add sugar of course, has no calories. Caffeine suppresses appetite. So if anything it makes you lose weight.
I'd add that "good" black coffee should not be particularly bitter, and should have a slight sweetness with origin characteristics like fruitiness. The world of fancy single origin coffees is a deep but enjoyable and not particularly expensive rabbit hole.
Seeds are full of carbs, minerals and proteins. Malting makes most of the calories water soluble which is why you malt grain to make alcohol. But even without it a little bit will make it into the broth.
What surprised me is the ratio of calories in black coffee versus espresso. I wonder if it’s solubility or the fact that fines make it through a screen but not a filter.