Data: Survival of the fattest?

We saw in a recent post that the women with poor health have the most kids.  Is this true for heavy women, too?  Yes, it is: look at this graph (General Social Survey, self-reported weight, N = 200):

Women with one child are the lightest group with a mean of 165.6 pounds.  Compare this to the heaviest group: Women with seven children weigh an average of 208.5 pounds. The difference is roughly one standard deviation -- huge, no pun intended.

Of course, it's hard for a woman to lose the weight she gains from being pregnant, but it is also possible that genes underlie both weight and fertility.

For example, perhaps women who score low on conscientiousness (self-discipline, long-term planning) lack control over both eating and fertility.

Americans are likely to get fatter and fatter as the generations go by.  If civilization eventually collapses under all the dysgenic trends I have been documenting lately, these fat Americans might finally lose weight due to food shortages.

UPDATE: Readers might suspect that a respondent's weight is due to her height, and perhaps tall women are having more babies.  I checked: fertility does not vary by height.