So, here we have a young woman in the UK who has has eaten nothing but Chicken McNuggets™ her whole life, and is in poor health, but a mystery remains:

…despite a diet that regularly means she eats at least a third more than the 56g of fat recommended by experts, she manages to keep relatively trim.

This may be down to the amount of exercise she does or to her metabolism.

Or maybe, just maybe, eating fat is not what makes you fat.

It is an awful diet, to be sure, but not because of what’s in it (fat) but because of what is not (healthy vegetables). It has a reasonable balance of protein and carbs (though it would be better if the carbs weren’t a batter, and could be a little lower). It’s the lack of nutrients that is killing her, not the fat.