Eating food in general decreases your perception of pain. A high fat meal knocks spots off of a high carbohydrate meal.
Both meals were 5.2% protein, the high fat was mediocre at 54% fat while still loaded with 42% from carbohydrate. The high carbohydrate meal really was high carbohydrate, at 88% of calories from carbohydrate and only 6.8% from fat.
More fat in the next pancakes please. And no flour, unless it's almond flour.
NB this research group, in common with the rest of the experimental world, finds that high fat meals make you sleepy. Absolutely incomprehensible to me personally!