Effect of food swap recommendations on the healthfulness and carbon footprint of grocery purchases in a naturalistic online store: A randomized parallel trial

Source briefing · A concise briefing based on one linked source. It is intentionally shorter than a full FreedomWitness Evidence Engine analysis.

What the source reports

by Anna H. Grummon, Kevin O’Sullivan, Amanda B. Zeitlin, Lindsey Smith Taillie, Cristina J. Y. Lee, Ashe J.

Walker, Verena Tiefenbeck, Elgar Fleisch, Clayton Ulm, Thomas N. Robinson Background Modeling studies suggest that simple dietary “swaps” in which just one food is replaced with another could yield both health and environmental benefits, but it remains unclear whether consumers make such changes when prompted. We tested whether recommending swaps improved the healthfulness and reduced the carbon footprint of simulated online grocery selections. Methods…

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Source & verification

Primary source: PLOS Medicine · August 21, 2026

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