Is a Handful an Effective Way to Guide Nut Recommendations?

Area of Science:

• Nutrition Science
• Dietary Assessment

Background:

• Dietary guidelines suggest 30 g of nuts daily for chronic disease risk reduction.
• Portion size guidance often uses a 'handful,' but its gram equivalent is not well-defined.
• Understanding practical portion sizes is crucial for adherence to dietary recommendations.

Purpose of the Study:

• To quantify the actual gram amounts of various nuts corresponding to different portion size descriptors.
• To compare the effectiveness of a 'handful' versus a '30 g serving' in guiding nut intake.
• To assess how different portion size instructions influence the quantity of nuts consumed.

Main Methods:

• 120 participants were randomized to receive three of six nut types (almonds, cashews, hazelnuts, macadamias, peanuts, walnuts).
• Participants were instructed to take specific portion sizes: 'usual serving,' 'handful,' 'small handful,' 'large handful,' and '30 g serving.'
• The gram weight of nuts for each portion size was measured and analyzed.

Main Results:

• The median 'handful' portion measured 36.3 g, while the '30 g serving' estimate was 28.7 g.
• A 'large handful' was approximately 61.3 g, and a 'small handful' was 16.7 g.
• 83% of portions were at least 80% of the 30 g recommendation when using a 'handful,' compared to 63% for a '30 g serving.'

Conclusions:

• A 'handful' serves as a practical and effective tool for guiding recommended daily nut intake.
• Using a 'handful' measure tends to result in consuming a quantity closer to or exceeding the recommended 30 g compared to explicit '30 g' instructions.
• This finding supports the use of 'handful' as a simple, accessible portion size guide in dietary recommendations.