Yogurt and hard cheeses generally have positive health associations, while butter has more documented negative aspects.

“They say 'dairy' as if it's some monolithic thing. With dairy, you've got the hard cheeses. You've got butter. You've got yogurt. You've got milk of varying fat levels. You're kind of hard pressed to find negative stuff on yogurt. You'd be kind of hard pressed actually to find negative stuff on hard cheeses. Of all the range of dairy foods, butter is the one that you can find the dirt on.”