【itisnotgoodforourhealth还是itisnotgoodtoourhealth还是...

it is not good for our health 还是it is not good to our health
be good for意思是“对……有好处”,从句意看应该选for,表示“对健康有好处”；
be good to意思是“对……好”,如“They are good to me.'他们对我很好.