6. Population changes.
There are now more older people as well as more Hispanics in the United States, and these groups have higher rates of obesity due to middle aged spread, and hereditary characteristics.

7. Older birth mothers.
Older birth mothers’ children are more prone to excess weight gain than the offspring of younger mothers.

8. Genetics. Obese moms may pass the trait onto their children in utero.

9. Higher body weight = greater fertility.
Heavy people produce more offspring than thinner people. Having said that, being obese can interfere with conception.

10. Assortative mating.
Heavy people tend to form relationships  with each other, and therefore produce heavy children.

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