It all makes sense now!
It turns out that Obese People Have 'Severe Brain Degeneration'
"A new study finds obese people have 8 percent less brain tissue than normal-weight individuals. Their brains look 16 years older than the brains of lean individuals, researchers said today."
It also turns out that the "fattest" States tend to vote Republican.
The Shrub carried 19 of the 20 most obese States when he was elected. So do the math, MacDonald's has given us MacPolitics.