This is mainly due to the correlation of higher carb intake with poverty, but it occurs even within smaller samples of countries at similar income levels. (perfecthealthdiet.com)
There was a definite and pronounced trend that faster times were correlated with higher carb intake per hour. (sweatscience.com)
As high carb intake continues, glucose floods the bloodstream, insulin levels increase, and so do the body's fat stores. (onketosis.com)