Forty subjects ( meanSEM : age 601years , BMI 24.90.6 kg/m ( 2 ) ; 30 females ) were included in a controlled , cross-over study and randomized to receive first a walnut-enriched ( 43g/d ) and then a Western-type ( control ) diet or vice-versa , with each lasting 8weeks and separated by a 2-week wash-out .