https://www.cdc.gov/nchs/images/databriefs/51-100/db51_fig4....
[the lower the PIR (poverty income ratio) the poorer]
https://www.cdc.gov/nchs/images/databriefs/51-100/db51_fig4....
[the lower the PIR (poverty income ratio) the poorer]
There's much more to weight than calories.
"Vegetable oils" are extracted from seeds, usually with the assistance of the petroleum distillate hexane. The polyunsaturated fatty acid (PUFA) portion of these oils is very unstable, so the producers use steam to remove the rancid odor from their "food-grade" product.
The PUFA's in vegetable oil are cluster bomblets that destroy people's health. IMHO, vegetable oil should only be used as biodiesel.
These children are mostly not malnourished, and in most cases their obesity could be solved (in the direct sense, ignoring why they overeat) by eating the same things in lesser quantities, at no cost to their health.
But cooking food at home is cheap as hell compared to paying for prepared food if only looking at the cost of the food or ingredients.