This might explain

Numbers might help explain things: we worked out that I need about 1800 calories per day to maintain and drew up a 3000 calorie plan. Later, I worked out that I've been averaging well above that, but the malabsorption factors in hugely--we worked out that I've been living, on average, a 1,500 calorie daily debt. Which explains a lot, it seems.

Time to rethink the 4 eggs in milk three times per day.