Do you lose weight on Mediterranean Diet? link
"A total of 7,447 persons in Spain were randomized to either
1- a Mediterranean diet with increased extra virgin olive oil,
2-a Mediterranean diet with increased nut intake, or
3-a control diet where the participants received low fat diet advice.
The high extra virgin olive oil group ingested an average of
3.6 tablespoons/day (51 grams/day equal to 459 calories/day)
of olive oil with 98% of it being extra virgin olive oil.
The high nut group ate 8.2% of their total daily calories in the form of nuts, including an additional approximately one ounce packet of nuts (15g of walnuts, 7.5 g of almonds, and 7.5g of hazelnuts) provided by the study coordinators. "