4. Normally your liver controls blood sugar, but because you eat so many carbs you have a constant supply of insulin circulating. This turns out to be bad—very bad. This causes you to become resistant to insulin.

5. Insulin resistance means your body pumps out more insulin to make up for the deficit. Now you're getting fat, but what's worse is that your body desires even more carbs as fodder for the excess insulin.

6. You get fatter and fatter and your body craves more carbs to feed your increasing girth. This destructive cycle is why Americans are so overweight (the process doesn't happen overnight).

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