In-shell pistachio nuts reduce caloric intake compared to shelled nuts.

Area of Science:

• Nutrition Science
• Behavioral Economics

Background:

• Portion control is a key strategy for weight management.
• The physical form of food can influence consumption patterns and satiety.

Purpose of the Study:

• To investigate whether consuming in-shell pistachios leads to lower caloric intake compared to shelled pistachios.
• To determine the impact of pistachio form on perceived fullness and satisfaction.

Main Methods:

• A controlled study with 140 university students evaluated pistachio consumption.
• Participants self-selected portions of either in-shell or shelled pistachios.
• Caloric intake, fullness, and satisfaction were measured after consumption.

Main Results:

• In-shell pistachio consumers ate 125 calories, while shelled consumers ate 211 calories, a 41% difference (p≤.01).
• No significant differences in fullness or satisfaction were reported between the two groups (p≥.01).
• Caloric intake was significantly influenced by the physical form of the pistachios.

Conclusions:

• Consuming in-shell pistachios can be an effective strategy for reducing overall calorie intake.
• The time and effort required for shelling may promote mindful eating and reduce consumption volume.
• Food form, not just caloric density, plays a crucial role in regulating energy intake.