Nutritional paradoxes of the new Dietary Guidelines for Americans (2025-2030): a critical analysis.

In January 2026, the new Dietary Guidelines for Americans were released, generating substantial international debate. Unlike previous editions, these guidelines were not primarily based on the report of the Dietary Guidelines Advisory Committee but on an independent scientific review, a process that raised concerns regarding transparency and potential conflicts of interest. This article critically examines the main recommendations of the new Dietary Guidelines for Americans, with particular emphasis on their implications for metabolic, cardiovascular, and kidney health. While the guidelines appropriately emphasize the reduction of ultra-processed food consumption and the promotion of minimally processed foods, several inconsistencies with contemporary scientific evidence are identified. Key concerns include the use of an outdated inverted food pyramid, a strong emphasis on high-protein intake (1.2-1.6 g/kg/day) predominantly from animal sources, and an internal contradiction between recommended protein intake and limits on saturated fat consumption. The proposed dietary pattern may also inadequately support gut microbiota health due to relatively low recommendations for fruits, vegetables, and whole grains. These issues may also be relevant to nephrology, given the growing popularity of high-protein diets and their potential renal implications. Overall, while the guidelines contain positive elements, their scientific coherence and alignment with established evidence-based dietary patterns remain questionable, potentially limiting their effectiveness as a public health tool.