Emphasis on may. note that there may be other factors and that one study does not make "the truth". Nonetheless an interesting potential health issue.

I used to both make and consume a considerable amount of tofu, however I forget when that was :

One tofu salad, no formaldehyde please.

I'm not surprised, you got to be crazy to eat that stuff in the first place!

Obviously you don't eat it, or you wouldn't remember! Or may be you do and you don't!

F-O-R-M-A-L-D-E-H-Y-D!!! Not only good for memory loss! One can get more out of it:
Formaldehyde is classified as a probable human carcinogen by the U.S. Environmental Protection Agency. The International Agency for Research on Cancer (IARC) has determined that there is "sufficient evidence" that occupational exposure to formaldehyde causes nasopharyngeal cancer in humans.
Formaldehyde can cause allergies and is part of the standard patch test series.
Formaldehyde has been banned in cosmetics in both Sweden and Japan.[Wikipedia]