原来还有如此说法。 我搜了一下，大概是这么回事。

Corn kernels have a tough outer hull made of cellulose, which is difficult for humans to digest. Our digestive enzymes cannot break down cellulose, so when we eat whole corn, much of it passes through our system undigeste，as such, it can cause cramps, abdominal pain, and gas in the process.

这应该是针对某些人而已。