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Food, herbs & supplements · health · Emerging
Ketone Ester Supplement Produces Different Brain And Body Effects By Sex In Aged Mice
Aged mice studySex-specific effectsMemory markersBody composition
A ketone ester supplement given to 24-month-old mice produced different effects in males and females, according to a study published in GeroScience. Males getting the supplement had lower body fat and higher relative lean mass, while females had fewer navigation errors in a memory maze test and lower levels of a brain inflammation marker.
Researchers gave 24-month-old male and female C57BL/6 mice, elderly by mouse standards, a diet supplemented with the ketone monoester (R)-3-hydroxybutyl (R)-3-hydroxybutyrate for a short-term period; exact sample size was not reported. The supplement raised post-meal beta-hydroxybutyrate, a ketone body the liver makes that cells can burn for fuel, and lowered post-meal blood glucose in both sexes. Beyond that shared metabolic shift, effects split by sex. Males getting the supplement had lower body fat and higher relative lean mass than untreated males. Females had fewer primary errors in the Barnes maze, a standard test of spatial memory, the ability to remember where things are, along with lower hippocampal IL-1beta, an inflammatory signaling protein measured in the brain's memory center. The researchers also found sex-dependent differences in fasting metabolite profiles across tissues and blood, and in hippocampal oxylipins, fat-derived signaling molecules involved in inflammation.
The authors frame ketone esters as a way to raise beta-hydroxybutyrate without the carbohydrate restriction a full ketogenic diet requires, which matters for older adults who struggle to sustain that kind of diet. Ketone bodies act as an alternative fuel for cells, including brain cells, and also work as signaling molecules that influence inflammation, which the researchers say may explain why the same supplement nudged body fat in males and memory and brain inflammation markers in females.
Further studies are needed to determine whether ketone monoester supplementation has similar sex-specific effects in humans
Data Panel
- Who
- 24-month-old male and female C57BL/6 mice, aged; exact sample size not reported
- Design
- Short-term dietary supplementation with the ketone monoester (R)-3-hydroxybutyl (R)-3-hydroxybutyrate versus standard diet, sexes analyzed separately
- Dose
- Ketone monoester added to diet; specific dose amount not reported
- Primary result
- Postprandial beta-hydroxybutyrate increased and postprandial glucose decreased in both sexes; effect sizes not reported
- Secondary
- Males: lower body fat and higher relative lean mass, magnitude not reported. Females: fewer Barnes maze primary errors and lower hippocampal IL-1beta, magnitude not reported
- Funding / conflicts
- Not reported
This is a mouse study, sample size not reported, and whether these sex-specific effects occur in humans is unknown.
Dr. Axe's Take
A supplement built to mimic ketosis did different jobs depending on sex: better body composition in males, better memory markers and less brain inflammation in females. That fits what I believe about metabolic therapy: hormonal biology shapes how mitochondria and inflammation respond to ketones, so a male-based protocol does not automatically apply to women. I would not extrapolate mouse dosing to a human supplement plan, but this strengthens the case for cycling in and out of nutritional ketosis periodically as we age, through a well-formulated ketogenic diet, intermittent fasting, or MCT oil, rather than leaning on carb restriction alone. Track your own response, especially around memory and inflammation, instead of assuming one protocol fits everyone.
— Dr. AxeDr. Axe Quiz