Effect of a portion-size default nudge on meat consumption and diner satisfaction: controlled experiments in Stanford University dining halls.

While taken together the two interventions (25% and 50% serving spoon size reductions) did not significantly reduce the amount of meat served, the daily decrease of ~ 12 lbs with a small effect size (SMD = 0.24) showed a trend in the expected direction.

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While this trend approached significance with a medium-to-large effect size, the confidence interval (CI) was wide and included the null.

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