What the study really said

If you’ve not already read the post on Junkfood Science, please, go do so now.
http://junkfoodscience.blogspot.com/2009/06/even-obesity-paradoxes-cant-excuse.html
Looking at corrected BMIs, according to the breakdowns adopted by the world’s governments, the authors found that compared to ‘normal’ BMIs (18.5 up to 25):
● being overweight (BMI 25 up to 30) was associated with a 25% lower risk of dying
● [...]