I think the math might be off on the number of carbs in those mug cakes. Coconut sugar has the same number of carbs as white cane sugar. It probably has a lower glycemic index. I write probably because, there haven't been many studies (two as far as far as a quick web search uncovers) and one of those two studies was of poor quality. So, it seems like that there are around 12 grams of carbs in each mug cake, just based on the sugar content. While the nut flour may be low carb, it does have some carbs. I think it's still fairly low carb for cake.