[CoryG89]

Surely there are plenty of plants containing chemicals which if injested in some way could cause a change in cell mutations.

[rubicon33]

To confirm your point, last time I checked, vegans were still dying from cancer too.

[gozur88]

You get DNA damage from a lot of different sources, from food to viruses to radiation to industrial chemicals to just plain replication errors.

I agree vegans probably still get cell damage from the food they eat, but that's not proof positive because they would still die from cancer even if they didn't.