My Leucistic Boyo's Gils Always Get Darker After Eating

Ok so this is strange: Kunzite, my adult leucy, always has a marked difference in the saturation of the color of his gils from before and after he eats a worm. What's up with that? I've had a leucy prior to Kunzite and this never happened to him. These photos are 100% unedited, by the way.

The 3rd picture is DURING mealtime, with his tankmate/BFF Trudeau, of course, so these aren't in sequential order. The second photo was taken AFTER he gobbled down his worm.