In this case, the pesky bugs, which are actually called weevils, infest the whole kernels and lay eggs in the wheat grains before it's been milled into flour, Quoc Le tells Delish. "Kernels that ...

Whole wheat flour, for example ... it's that older flours have more opportunity to become infested with insects," Myhrvold explained. As with many pantry items, the longer they're sitting around ...