Neither sugar nor fat consumption seem to be a good indicator of obesity (child, operation)

[Woof]

Where people around the world eat the most sugar and fat - The Washington Post

.............Germany, which ranks second in both sugar and fat consumption per capita, is among the skinniest nations in the developed world. Only 14.7 percent of its population over the age of 14 is considered obese, according to data from the Organization for Economic Co-operation and Development (OECD). Similarly, other countries, including Belgium, the Netherlands, Finland and Sweden, are both near the top in sugar and fat intake, and near the bottom in obesity rates..............

[Woof]

Yes ...... my parents and family in Switzerland were of ordinary weight until after they had moved here, then each successive child they had was fatter and fatter, the last child being fattest.