Although pistachios are known to have a high fat content, their fat may not be completely absorbed by the body, i.e. for humans, they may contain fewer calories than we first thought, researchers from reported in the British Journal of Nutrition. A randomized, controlled-feeding trial carried out by the ARS (Agricultural Research Service) of the USDA (US Dept. of Agriculture) suggests that pistachios are probably the lowest-calorie nuts around, with just 160 calories per 30 grams. David J. Baer, Ph.D. and team gave regular measured amounts of pistachios to 16 healthy volunteers... 
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