Where to draw the line on too much of a good thing

Humans tend to share a certain creed that goes something like this: If one is good, two are better. That’s fine when it comes to dollars in the collection plate or hours spent volunteering, but not so with certain research-has-shown items consumed in the name of health. Think nuts, red wine and dark chocolate.

http://www.canada.com/health/Where+draw+line+much+good+thing/4360712/story.html