@Inginsub
I just checked. Looks like my BMI is ~34.5.
I think my IQ is in the 110-125 range.
Looks like this is about childhood intelligence and the adult/old age BMI.
So what this graphic actually says isn't that fat people are likely smart, but that smart people have a higher chance to stay/get thin as they age.
It might also say that smart people don't reach the age of 51 if they are fat.
So it's probably likely that I will die if I don't lose weight in the next 20 years.