It's not a question of eating a lot. Gorging on pasta when pregnant will just produce a type I diabetic child. The issue is animal/fish fat consumption. Women and children need quite a bit of it.
High pasta diets are not exactly on the menu in Mexico.
ORLY?
Seriously, is there study that show a low-fat/type I diabetes connection?
When mom eats french fries and rice the insulin spikes permanently screw up the kid's endocrine system, leaving a propensity to obesity if not diabetes.
Japan is in love with fat in all its forms (fatty marbled beef, fatty tuna, fatty pork) and there is almost no culture of sun-screen usage, but they also are much better at producing melanin than europeans, making for pretty effective natural protection.
They also have one of (if not the) largest populations of centenarians on earth.
I think you meant "Type II".