Prospective study of nut consumption, long-term weight change, and obesity risk in women.
Bes-Rastrollo M, Wedick NM, Martinez-Gonzalez MA, Li TY, Sampson L, Hu FB.
Am J Clin Nutr. 2009;89(6):1913-1919.
Because nuts contain fat, there is the misperception that people who eat nuts may weigh more. To study this, over 50,000 women between the ages of 20 and 45 years were asked about their intake of nuts, including pistachios, over 8 years.
Those women who ate nuts 2 or more times per week tended to weigh less.
The authors conclude that eating nuts does not lead to greater weight gain and may help with weight control when included in a balanced diet.