Even meat has trace amounts. Eggs are less than half a gram apiece. Butter, I'm not sure about, but dairy can complicate the diet--you might want to try without butter and then add it in and see what happens. All of my health issues (I took them for normal parts of aging) have disappeared, except for a slightly runny nose. I'm going to see if giving up dairy (mostly heavy cream in my coffee, but some butter) will fix that.