Estrogen may be protective against adverse effects

SAN ANTONIO, Aug. 28, 2025 /PRNewswire/ -- Could a keto diet affect males differently from females? A study from The University of Texas Health Science at San Antonio (UT Health San Antonio) suggests so, and estrogen could promote different protections against adverse effects of the diet like the accumulation of cells expressing markers of age, or senescence.

The study, published Aug. 26 in the journal Cell Reports, found that male, but not female, mice on a ketogenic diet showed the accumulation of cells in organs expressing markers of cellular senescence. A keto diet is a popular low-carbohydrate, high-fat regimen that can help some Type 2 diabetes patients control blood sugar and those with epilepsy manage seizures. Cells expressing senescence markers can contribute to age-related declines in overall bodily function.

"These results suggest sex specificity alters the effects of a ketogenic diet, with important clinical implications," said David Gius, MD, PhD, assistant dean of research and professor with the Department of Radiation Oncology at UT Health San Antonio, associate cancer director for translational research at the institution's Mays Cancer Center and investigator for its Barshop Institute for Longevity and Aging Studies.

He is lead author of the study, titled, "Divergent sex-specific effects on a ketogenic diet: Male, but not female, mice exhibit oxidative stress and cellular senescence."

Ketogenic diets induce ketogenesis, the generation of ketone bodies or water-soluble molecules from fat for use as fuel in place of glucose. They have shown benefits in controlling refractory epilepsy and are being investigated as potential therapies for other health conditions.

In the past decades, keto diets also have become popular in North America and Europe for weight loss.

While the diets can improve certain health parameters, evidence from mice and clinical studies suggest the effects may be dependent on multiple variables, including adherence, metabolism and, importantly, sex, suggesting that hormone status may impact response.

Gius says the role of gender in the response to keto diets has been understudied. One reason is that male mice have been used extensively for in vivo basic and translational research because it was assumed that females would give less consistent results due to variability from the estrous cycle. Recent studies, however, suggest that largely is unfounded.

In the new study, Gius' team observed a keto-diet-induced increase in cellular senescence only in male mice, except when they were given the female hormone estrogen. Male mice on a keto diet also exhibited an increase in markers of oxidative stress, which is known to contribute to senescence in cells.

Notably, the researchers found, estrogen or estradiol treatment prevented increases in cell senescence and oxidated stress in male mice on a keto diet, as did several established antioxidants.

They also observed that when females were administered tamoxifen, a "selective estrogen receptor inhibitor" that blocks the effects of estrogen, they then exhibited an increase in oxidative stress and cells expressing senescence markers, the same as male mice. "These results strongly suggest that estrogen is an important variable in the response to a ketogenic diet," Gius said.

The researchers also found that a high-fat diet – comprising more carbohydrates than a keto diet – also induces cellular senescence in male, but not female, mice.

Other authors of the study also are with the Mays Cancer Center, the Barshop Institute and the Long School at UT Health San Antonio, as well as with Houston Methodist Cancer Center, Houston Methodist Research Institute and Galera Therapeutics Inc.

Divergent sex-specific effects on a ketogenic diet: Male, but not female, mice exhibit oxidative stress and cellular senescence

Sung-Jen Wei, Joseph Schell, Wei Qian, Martin Silguero, Agne Baseviciene, Wan Hsi Chen, Rolando Trevino Jr., E. Sandra Chocron, Meredith M. Ogle, Mahboubeh Varmazyad, Gloria M. Martinez, Diego Cruz, Brandon Lorenzana, Felix F. Dong, Haiyan Jiang, Alia Nazarullah, Robert A. Beardsley, Kumar Sharma, Jenny Chang, Erin Munkácsy, David Gius

Published Aug. 26, 2025, in Cell Reports

Link to the full study: Divergent sex-specific effects on a ketogenic diet: Male, but not female, mice exhibit oxidative stress and cellular senescence - ScienceDirect

The University of Texas Health Science Center at San Antonio (UT Health San Antonio) is one of the country's leading health science and research universities. With missions of teaching, research and patient care, its schools of medicine, nursing, dentistry, health professions, graduate biomedical sciences and public health have graduated more than 45,000 alumni who are leading change, advancing their fields and renewing hope for patients and their families throughout South Texas and the world. To learn about the many ways "We make lives better®," visit UTHealthSA.org.

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The UT Health San Antonio Joe R. and Teresa Lozano Long School of Medicine is listed among U.S. News & World Report's best medical schools, ranking in the top 30% nationwide for research. To learn more, visit https://uthscsa.edu/medicine/.

The Mays Cancer Center at UT Health San Antonio is one of only four National Cancer Institute-designated Cancer Centers in Texas. The Mays Cancer Center provides leading-edge cancer care, propels innovative cancer research and educates the next generation of leaders to end cancer in South Texas. In 2017, Mays Cancer Center became one of a select few centers in the nation to partner with MD Anderson Cancer Center, expanding access to cancer treatments that are among the most advanced in the nation–close to home. To learn more, visit https://cancer.uthscsa.edu.

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The Sam and Ann Barshop Institute for Longevity and Aging Studies is one of the world's premier institutes dedicated to the study of age-related diseases. The Barshop Institute is the only aging-intensive research institute in the country to have four peer-reviewed designations: two National Institute on Aging (NIA)-funded centers (Nathan Shock and Claude D. Pepper centers), a testing site of the NIA-sponsored Interventions Testing Program, and a U.S. Department of Veterans Affairs Geriatric Research, Education and Clinical Center.

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SOURCE UT Health San Antonio