Claude L Hughes, M.D. Ph.D.

10/12/2026

In the forthcoming perspective,“Dietary Diversity Deficiency: The Phytochemical Desert of
Ultra-Processed Foods,” Claude Hughes, proposes a novel framework for
understanding the health effects of ultra-processed foods (UPFs). Rather than focusing solely on
what UPFs contain, such as added sugars, refined starches, sodium, and other highly processed
ingredients, the article examines what these foods may lack: the rich diversity of phytochemicals and
other bioactive compounds naturally found in diverse whole-food diets. The paper introduces the
concept of“dietary diversity deficiency,” suggesting that chronic consumption of phytochemically
sparse diets may create a “phytochemical desert” that influences the gut microbiome, immune
regulation, inflammation, metabolic health, and long-term disease risk. Drawing on evidence from
nutrition science, microbiome research, and food systems ecology, the article argues that dietary
diversity itself may be a biologically important determinant of health and outlines research strategies
to test this hypothesis. This thought-provoking perspective offers a fresh lens through which to
consider the relationship between modern food environments and chronic disease.

Keywords

Dietary diversity, phytochemical diversity, ultra-processed foods, dietary diversity deficiency, phytochemical desert

Reference

Hughes C. Dietary Diversity Deficiency: The Phytochemical Dessert of Ultra-Processed Foods. Glob Clin Transl Res. 2026;8(4）:1-11. DOI:10.36316/gcatr.08.0050