They can't comprehend it. They see you in a moment of time eating. They assume you eat it constantly all throughout the day like they do. They eat that 330 kcal burrito, and then go drink a latte, and then go get froyo, and then stop off for a soda, then get ice cream from Sonic, then go to Whataburger, then order in oily Chinese food, etc. My experience is fats eat CONSTANTLY. Their life exists only as moments between meals.