Inaccurate and conflicting messages about what to eat are pervasive, often resulting from a single, flawed study. That’s why the Dietary Guidelines synthesis of all the evidence is so important. Systematic reviews and meta-analyses that combine findings, excluding poorly conducted or biased studies, more accurately evaluate the relationships between diet and health. Urge the Dietary Guidelines for Americans Committee and USDA to allow the review of all high-quality systematic reviews, not just USDA's own.