[fghgfdfg]

From a quick google search, it appears the methyl group gets converted to methanol.

[photogrammetry]

Which we all know has no ill effects whatsoever.

/s

[bunderbunder]

In very high quantities, yeah, it's bad. Just like everything, including water and oxygen.

In small amounts, your body can handle methanol just fine. Which is fortunate, because it's present in many foods at much higher levels than what you'd get from drinking a can of Diet Coke.