It certainly is bad in the long term, but I'm talking about the immediate fiscal benefits divorce itself (over being the other party, you obviously end up with less than the sum of your former family resources, anything else would be insane), not the consequences of becoming unmarried. Bad marriages and the capital toll of having children are why we make divorce proceedings lopsided, but even lopsided proceedings can't account for the cost of being unmarried after prioritizing reproduction†.
That being said, the number that says household income decreases 45% seems pretty hopeful. That means that these women end up (in aggregate) making 55% of the income of (potentially) a two-income household. If you're willing to adjust your housing arrangement after a change like that, you'll generally get by just fine†.
As for the food consumption figure (which seems difficult to make numeric, to me [is it normalized by dollars? by calories? by weight?]), I'm sure that was once an important outcome, generally in the U.S. a reduction in overall food consumption of less than one fifth is no disaster†. A reduction in consumption makes sense after a reduction in household income.
Added:
> or a disrupted relationship in which they live with a male outside of marriage
This would seem to mess with the numbers a bit, since generally non-marriage relationship splits (which should be as or more common than divorces, in general†) don't end in a court-mediated property division†, and when they do, it doesn't work out the way that divorce proceedings do†.
† no data to back this up, mostly baseless conjecture.