They were never eating low-fat, so thanks for proving my point.

The low-fat diets I've been recommending from plant-based diet promoters, like Dr. McDougall (Starch Solution), Dr. Esselstyn and his son (Engine 2), Dr. T. Colin Campbell (China Study/Whole), Dr. Dean Ornish, Dr. Graham (80-10-10), and Durianrider & Freelee (Raw Til 4), all recommend eating high-carb with a limit of about 10% of calories from fat and this low-fat diet lifestyle they are following is not making them fat as you can see with your own eyes.

The average fat intake percentage that study listed for both men and women was 32.8% at the lowest. That's still over THREE TIMES the fat limit those low-fat diet promoters recommend.

Lowest fat macro ratio in that study:
Men = 49 carbs/15.5 protein/32.8 fat
Women = 51.6 carbs/15.1 protein /32.8 fat

Recommended low-fat macro ratio:
80 carbs/10 proteins/10 fats

All the average person was doing, according to that study, was increasing their total calorie intake, increasing their intake of refined carbs and sugar, while barely decreasing their protein & fat intake. Then factor in people were becoming much more sedentary from increasing white-collar jobs and the internet. No wonder obesity and diabetes has been exploding.

This is what's been causing the recent obesity and diabetes explosion in China (see here, here) as their average citizens are moving to more sedentary jobs, traveling by car instead of riding bikes, being able to afford adding more meat & dairy to their traditional starch-based diets (rice & noodles) along with the influx of western high-fat fast food restaurants in their country.

As I've always been saying, it's not the carbs, but too much fat added to carb-based diets that turn carbs bad by interfering with carb metabolism.