It doesn't say that. Try reading it more carefully.
Yes it does.
"The UK is the most overweight nation in Western Europe, with levels of obesity growing faster than in the US, a new report has warned.
The Organisation for Economic Cooperation and Development (OECD) said Britain was the sixth-worst country in its 35 member states, coming behind Mexico, the USA, New Zealand, Finland and Australia."
(from the link in the OP)
The USA ( and 5 other countries) have MORE fatsoes then the US does
according to the article.
Britain is plowing Mexico, the USA, New Zealand, Finland and Australia from behind