I'd guess it's a combination of this and the overweight/obesity rate climbing, the venn diagrams between "people who want to sleep with you" and "people you want to sleep with" are probably diverging for many.
I agree, but for a different reason. Excess fat is an endocrine disruptor: adipose tissue makes Aromatase [1], which converts testosterone -> estrogen.
[1] https://en.wikipedia.org/wiki/Aromatase
Adipose tissue is the greatest peripheral
source of aromatase in both males and
females,[citation needed] contributing
to the production of estradiol.Normal Testosterone levels -> normal libido.
Excess estrogen causes problems for both male & female bodies.