This article in The Daily Mail [via MA] says that over 70% of adults in many parts of the developed world (especially North America) are overweight or obese.
While North America still has the highest percentage of overweight adults at 70%, regions such as Australasia and southern Latin America are now not far behind with 63%.
The article mentions rising incomes as one causal factor.
My own guess is that cheap carbohydrates and high-fructose corn syrup contribute to these numbers. Also reduced physical activity likely plays a role.
Four years ago, my BMI was over 28. I knew I wanted to do some serious (for me) hiking that coming summer, so I embarked on a diet and exercise plan that lowered my BMI to slightly under 25. [Note: I use this BMI calculator and acknowledge that my height has shrunk a tad in the past decade or so as I have aged.]
But I had trouble keeping it there. A year and a half ago, inspired in part by Scoop (a former student) and other information [see this and this], we went on a form of the Atkins diet, emphasizing more veggies and very few carbs. That plus continued attempts to stay slightly active have kept my BMI below 25 for the entire period since then, despite some ups and downs surrounding holidays, when I am simply unable to resist sweets and starches.
One good thing I have learned, though, is that when I do splurge and eat far too many carbs, going back on the low-carb diet gets me right back on track.
Okay. I'm not in great condition. And I'd love to lose another 10 lbs, which I'm sure I could do if I'd be more conscientious about the low-carb diet. But overall this plan is working well.