At Indiana University School of Public Health-Bloomington, researchers just completed a study that challenges a common assumption about beef and metabolic health. Over four weeks, adults with prediabetes who ate 6 to 7 ounces of beef daily showed no worsening of blood sugar regulation, insulin function, or inflammation compared to those eating poultry instead. The finding arrives at a moment when more than 135 million American adults either have type 2 diabetes or face an elevated risk of developing it—making trustworthy nutrition guidance increasingly urgent.
The randomized controlled trial, published in Current Developments in Nutrition, examined how unprocessed beef affects the body's ability to manage glucose and insulin. This matters because type 2 diabetes develops gradually as the body becomes resistant to insulin, and the pancreatic cells that produce insulin lose their capacity to function properly. Understanding whether everyday proteins like beef interfere with these processes could reshape how people with prediabetes approach their diets.
The study enrolled 24 adults ranging from 18 to 74 years old—17 men and 7 women—all living with overweight or obesity alongside prediabetes but otherwise in good health. Using a crossover design, every participant followed both diet patterns during the trial: two separate 28-day periods eating meals with either beef or poultry, separated by a 28-day break to let their bodies reset. Each meal contained roughly 3.0 to 3.5 ounces of meat, prepared in familiar formats like fajitas, burgers, stew, burritos, and stir-fry. Before and after each dietary phase, researchers measured pancreatic β-cell function—the cells that produce insulin—along with insulin sensitivity and glucoregulatory hormones.
The results showed no statistically significant differences between beef and poultry across any measure of pancreatic function or insulin sensitivity. Daily consumption of unprocessed beef produced metabolic outcomes nearly identical to poultry in this at-risk population. "When beef is consumed as part of a healthy dietary pattern, it helps fill essential nutritional gaps and does not adversely impact the cardiometabolic risk profile compared to poultry," said Kevin C Maki, PhD, Adjunct Professor at Indiana University School of Public Health-Bloomington and the study's senior author.
Indika Edirisinghe, PhD, Professor of Food Science and Nutrition at Illinois Institute of Technology, emphasized that even though the study lasted just one month, this timeframe is generally considered sufficient to detect measurable metabolic changes. "The study findings suggest that regular beef intake does not adversely affect metabolic or inflammatory risk factors compared with poultry in an at-risk prediabetic population," she noted.
The research was funded by the National Cattlemen's Beef Association, a contractor to the Beef Checkoff. According to the researchers, the organization did not collect or analyze data, did not participate in publication decisions, and only reviewed a draft manuscript before submission—a disclosure that matters for readers evaluating potential bias in nutrition research.
For the millions of Americans navigating prediabetes, the takeaway is practical: choosing unprocessed beef as part of a balanced diet does not appear to sabotage blood sugar control or metabolic health. The finding opens space for more nuanced conversations about protein sources, moving beyond blanket dietary rules toward evidence-based choices tailored to individual health situations.