I felt sorry for that lady who was overweight and couldn't understand why. When she kept a food diary that recorded 1100 calories but her wee showed she'd eaten 3000. She looked genuinely shocked, its scary that someone can eat an extra 2000 calories without realising it.
i found it really interesting but what got me was when they did the dairy bit, they didn't explain what they had cut out of the diet. If they had 2 weeks of exactly the same food, calories and fat, but week two was dairy rich they must have cut something out to keep it the same amount of calories. Could have just been portion size but they didn't say.