Associate Professor Mike Garratt

2026

Journal - Research Article

Young, C., Garratt, M., Athukorala, T., Perry, T., Ponnampalam, A., Crengle, S., Peng, M., & Reynolds, A. (2026). Maternal macronutrient intake and gestational diabetes: Systematic review of prospective observational studies and dose-response meta-analyses. BMC Medicine. Advance online publication. doi: 10.1186/s12916-026-04748-5

Morland, F., Malcolm, M. H., Wilkinson, L., Neyt, C., Grattan, D. R., Brandon, A. E., … Senior, A. M., … Perry, T. L., & Garratt, M. (2026). Distinct macronutrient ratios optimize offspring survival, growth, and maternal glucose tolerance across mouse reproduction. PNAS, 123(1), e2513044123. doi: 10.1073/pnas.2513044123

2025

Journal - Research Article

Garratt, M., Lagisz, M., Staerk, J., Neyt, C., Stout, M. B., Isola, J. V. V., … Nakagawa, S. (2025). Sterilization and contraception increase lifespan across vertebrates. Nature. Advance online publication. doi: 10.1038/s41586-025-09836-9

Wilkinson, L. R. B., Try, H., Robertson, S. A., Brooks, R. C., & Garratt, M. (2025). Prior mating without fertilization increases subsequent litter size in mice. Biology Letters, 21(4), 20240659. doi: 10.1098/rsbl.2024.0659

Agbor Epse Muluh, E., McCormack, J. C., McLeod, S. C., Abeywickrema, S., Hooton, J., Garratt, M., Halberstadt, J., & Peng, M. (2025). Exploring comfort food cravings during pregnancy: A cross-sectional survey study. Appetite. Advance online publication. doi: 10.1016/j.appet.2025.107983

Sugrue, V. J., Prescott, M., Glendining, K. A., Bond, D. M., Horvath, S., Anderson, G. M., Garratt, M., Campbell, R. E., & Hore, T. A. (2025). The androgen clock is an epigenetic predictor of long-term male hormone exposure. PNAS, 122(3), e2420087121. doi: 10.1073/pnas.2420087121

Browne, H., Garratt, M., & Peng, M. (2025). Impacts of motherhood on energy intake and macronutrient choice: A comparative study. Food Quality & Preference, 125, 105370. doi: 10.1016/j.foodqual.2024.105370

Conference Contribution - Published proceedings: Abstract

Sugrue, V. J., Prescott, M., Glendining, K. A., Zoller, J. A., Narayan, P., Lu, A. T., Bond, D. M., Ortega-Recalde, O. J., … Anderson, G. M., Garratt, M., Horvath, S., Campbell, R. E., & Hore, T. A. (2025). Building the androgen clock: An epigenetic predictor of long-term male hormone exposure. Proceedings of the Genetics Otago (GO) Annual Symposium. Retrieved from https://blogs.otago.ac.nz/go

2024

Journal - Research Article

Camon, C., Prescott, M., Neyt, C., Decourt, C., Stout, M. B., Campbell, R. E., & Garratt, M. (2024). Systemic metabolic benefits of 17α-estradiol are not exclusively mediated by ERα in glutamatergic or GABAergic neurons. GeroScience, 46, 6127-6140. doi: 10.1007/s11357-024-01192-2

Miller, R. A., Harrison, D. E., Cortopassi, G. A., Dehghan, I., Fernandez, E., Garratt, M., … Strong, R. (2024). Lifespan effects in male UM-HET3 mice treated with sodium thiosulfate, 16-hydroxyestriol, and late-start canagliflozin. GeroScience, 46, 4657-4670. doi: 10.1007/s11357-024-01176-2

Garratt, M., Try, H., Neyt, C., & Brooks, R. C. (2024). Exposure to female olfactory cues hastens reproductive ageing and increases mortality when mating in male mice. Proceedings of the Royal Society B, 291, 20231848. doi: 10.1098/rspb.2023.1848

Agbor Epse Muluh, E., McCormack, J. C., Mo, Y., Garratt, M., & Peng, M. (2024). Gustatory and olfactory shifts during pregnancy and the postpartum period: A systematic review and meta-analysis. Physiology & Behavior, 273, 114388. doi: 10.1016/j.physbeh.2023.114388

Journal - Research Other

Camon, C., Garratt, M., & Correa, S. M. (2024). Exploring the effects of estrogen deficiency and aging on organismal homeostasis during menopause. Nature Aging, 4(12), 1731-1744. doi: 10.1038/s43587-024-00767-0

Conference Contribution - Verbal presentation and other Conference outputs

Sugrue, V. J., Prescott, M., Glendining, K. A., Zoller, J. A., Narayan, P., Lu, A. T., Bond, D. M., Ortega-Recalde, O. J., … Anderson, G. M., Garratt, M., … Campbell, R. E., & Hore, T. A. (2024, August-September). Androgen-dependent effects on epigenetic aging based on DNA methylation at androgen-regulated loci. Verbal presentation at the 18th New Zealand Medical Sciences Congress (MedSci), Queenstown, New Zealand.

Boer, G. A., Rizwan, M. Z., Ladyman, S., Garratt, M., & Tups, A. (2024, August-September). Control of energy balance by hypothalamic and hindbrain GIP receptors. Verbal presentation at the 18th New Zealand Medical Sciences Congress (MedSci), Queenstown, New Zealand.

Camon, C., Clarkson, J., Decourt, C., Prokai-Tatrai, K., Campbell, R. E., & Garratt, M. (2024, August-September). DHED, a brain specific 17βE2 prodrug, affects gonadal steroid receptor expression but not metabolic function. Verbal presentation at the 18th New Zealand Medical Sciences Congress (MedSci), Queenstown, New Zealand.

2023

Journal - Research Article

Garratt, M., Neyt, C., Ladyman, S. R., Pyrski, M., Zufall, F., & Leinders-Zufall, T. (2023). Sensory detection of female olfactory cues as a central regulator of energy metabolism and body weight in male mice. iScience, 26, 106455. doi: 10.1016/j.isci.2023.106455

Herrera, J. J., Pifer, K., Louzon, S., Leander, D., Fiehn, O., Day, S. M., … Garratt, M. (2023). Early or late-life treatment with acarbose or rapamycin improves physical performance and affects cardiac structure in aging mice. Journals of Gerontology Series A, 78(3), 397-406. doi: 10.1093/gerona/glac221

Journal - Research Other

McCormack, J. C., Roberts, R., Garratt, M., Wang, T., Hayes, J., & Peng, M. (2023). Longitudinal study of Energy, Neurosensory and Eating Responses durinG pregnancY (ENERGY cohort): A study protocol. Clinical Nutrition ESPEN, 54, 271-276. doi: 10.1016/j.clnesp.2023.01.033

Conference Contribution - Published proceedings: Abstract

Garratt, M. (2023). Mammalian life-extension by female contraception and male castration. Proceedings of the ESA-SRB and ENSA Annual Scientific Meeting. 183. Retrieved from https://www.endocrinesociety.org.au

Sugrue, V. J., Zoller, J. A., Narayan, P., Lu, A. T., Ortega-Recalde, O. J., Grant, M. J., … Bond, D. M., … Campbell, R., Garratt, M., … Hore, T. A. (2023). Male-specific DNA aging and building the Androgen Clock. Proceedings of the Genetics Otago (GO) Annual Symposium & Workshops. Retrieved from https://blogs.otago.ac.nz/go

Conference Contribution - Verbal presentation and other Conference outputs

Malcolm, M. H., Morland, F., Neyt, C., Camon, C., Wilkinson, L., Solon-Biet, S. M., Perry, T., & Garratt, M. (2023, August). High-protein diets impair glucose tolerance in late pregnancy in mice. Verbal presentation at the 17th New Zealand Medical Sciences Congress (MedSci), Queenstown, New Zealand.

Camon, C., Neyt, C., Prescott, M., Stout, M., Campbell, R., & Garratt, M. (2023, August). The metabolic effects of 17-alpha estradiol are not exclusively mediated by estrogen receptor alpha in glutamatergic or GABAergic neurons. Verbal presentation at the 17th New Zealand Medical Sciences Congress (MedSci), Queenstown, New Zealand.

2022

Journal - Research Article

Isola, J. V. V., Veiga, G. B., de Brito, C. R. C., Alvarado‑Rincón, J. A., Garcia, D. N., Zanini, B. M., … Garratt, M., … Stout, M. B. (2022). 17α-estradiol does not adversely affect sperm parameters or fertility in male mice: Implications for reproduction-longevity trade-offs. GeroScience. doi: 10.1007/s11357-022-00601-8

Garratt, M., Erturk, I., Alonzo, R., Zufall, F., Leinders-Zufall, T., Pletcher, S. D., & Miller, R. A. (2022). Lifespan extension in female mice by early, transient exposure to adult female olfactory cues. eLIFE, 11, e84060. doi: 10.7554/eLife.84060

Conference Contribution - Published proceedings: Abstract

Sugrue, V. J., Garratt, M., Campbell, R. E., & Hore, T. A. (2022). Androgens and the epigenetic clock. Proceedings of the joint ESA-SRB-APEG-NZSE Annual Scientific Meeting. 13. Retrieved from https://www.esa-srb-apeg-nzse.org

Conference Contribution - Verbal presentation and other Conference outputs

Sugrue, V. J., Zoller, J. A., Narayan, P., Lu, A. T., Ortega-Recalde, O. J., Grant, M. J., … Bond, D. M., … Campbell, R., Garratt, M., … Hore, T. A. (2022, August-September). Male-specific DNA aging and building the Androgen Clock. Verbal presentation at the 16th New Zealand Medical Sciences Congress (MedSci), Queenstown, New Zealand.

2021

Journal - Research Article

Debarba, L. K., Jayarathne, H. S. M., Miller, R. A., Garratt, M., & Sadagurski, M. (2021). 17-a-estradiol has sex-specific effects on neuroinflammation that are partly reversed by gonadectomy. Journals of Gerontology Series A. doi: 10.1093/gerona/glab216

Sugrue, V. J., Zoller, J. A., Narayan, P., Lu, A. T., Ortega-Recalde, O. J., Grant, M. J., … Bond, D. M., … Garratt, M., … Hore, T. A., & Horvath, S. (2021). Castration delays epigenetic aging and feminizes DNA methylation at androgen-regulated loci. eLIFE, 10, e64932. doi: 10.7554/eLife.64932

Garratt, M., Try, H., & Brooks, R. C. (2021). Access to females and early life castration individually extend maximal but not median lifespan in male mice. GeroScience, 43, 1437-1446. doi: 10.1007/s11357-020-00308-8

Conference Contribution - Published proceedings: Abstract

Sugrue, V. J., Zoller, J. A., Narayan, P., Lu, A. T., Ortega-Recalde, O. J., Grant, M. J., … Bond, D. M., … Garratt, M., … Hore, T. A., & Horvath, S. (2021). Castration delays epigenetic aging and feminises DNA methylation at androgen- regulated loci. Proceedings of the Genetics Otago (GO) Annual Symposium. Retrieved from https://blogs.otago.ac.nz/go

2020

Journal - Research Article

Herrera, J. J., Louzon, S., Pifer, K., Leander, D., Merrihew, G. E., Park, J. H., … Garratt, M. (2020). Acarbose has sex-dependent and -independent effects on age-related physical function, cardiac health, and lipid biology. JCI Insight, 5(21), e137474. doi: 10.1172/jci.insight.137474

Garratt, M., Try, H., Smiley, K. O., Grattan, D. R., & Brooks, R. C. (2020). Mating in the absence of fertilization promotes a growth-reproduction versus lifespan trade-off in female mice. PNAS, 117(27), 15748-15754. doi: 10.1073/pnas.2003159117

Lemaître, J.-F., Ronget, V., Tidière, N., Allainé, D., Berger, V., Cohas, A., … Garratt, M., … Gaillard, J.-M. (2020). Sex differences in adult lifespan and aging rates of mortality across wild mammals. PNAS, 117(15), 8546-8553. doi: 10.1073/pnas.1911999117

Journal - Research Other

Lemaître, J.-F., Garratt, M., & Gaillard, J.-M. (2020). Going beyond lifespan in comparative biology of aging. Advances in Geriatric Medicine & Research, 2(2), e200011. doi: 10.20900/agmr20200011

Garratt, M. (2020). Why do sexes differ in lifespan extension? Sex-specific pathways of aging and underlying mechanisms for dimorphic responses. Nutrition & Healthy Aging, 5, 247-259. doi: 10.3233/NHA-190067

2019

Journal - Research Article

Harrison, D. E., Strong, R., Alavez, S., Astle, C. M., DiGiovanni, J., Fernandez, E., … Garratt, M., … Miller, R. A. (2019). Acarbose improves health and lifespan in aging HET3 mice. Aging Cell, 18(2), e12898. doi: 10.1111/acel.12898

Tyshkovskiy, A., Bozaykut, P., Borodinova, A. A., Gerashchenko, M. V., Ables, G. P., Garratt, M., … Gladyshev, V. N. (2019). Identification and application of gene expression signatures associated with lifespan extension. Cell Metabolism, 30(3), 573-593. doi: 10.1016/j.cmet.2019.06.018

Gale, T. J., Garratt, M., & Brooks, R. C. (2019). Female mice seek refuge from castrated males, but not intact or vasectomized males, mitigating a socially-induced glucocorticoid response. Physiology & Behavior, 211, 112678. doi: 10.1016/j.physbeh.2019.112678

Garratt, M., Leander, D., Pifer, K., Bower, B., Herrera, J. J., Day, S. M., … Miller, R. A. (2019). 17-α estradiol ameliorates age-associated sarcopenia and improves late-life physical function in male mice but not in females or castrated males. Aging Cell, 18(2), e12920. doi: 10.1111/acel.12920

Conference Contribution - Poster Presentation (not in published proceedings)

Garratt, M., & Miller, R. A. (2019, August-September). 17-α Estradiol ameliorates age-associated sarcopenia and improves late life physical function in male mice but not in females or castrated males. Poster session presented at the Queenstown Molecular Biology (QMB) Meetings, Queenstown, New Zealand.

2018

Journal - Research Article

Garratt, M., Lagerborg, K. A., Tsai, Y.-M., Galecki, A., Jain, M., & Miller, R. A. (2018). Male lifespan extension with 17‐α estradiol is linked to a sex‐specific metabolomic response modulated by gonadal hormones in mice. Aging Cell, 17(4), e12786. doi: 10.1111/acel.12786

Gale, T., Garratt, M., & Brooks, R. C. (2018). Perceived threats of infanticide reduce maternal allocation during lactation and lead to elevated oxidative damage in offspring. Functional Ecology, 32(9), 2158-2169. doi: 10.1111/1365-2435.13146

Ronget, V., Gaillard, J.-M., Coulson, T., Garratt, M., Gueyffier, F., Lega, J.-C., & Lemaître, J.-F. (2018). Causes and consequences of variation in offspring body mass: Meta-analyses in birds and mammals. Biological Reviews, 93(1), 1-27. doi: 10.1111/brv.12329

Journal - Research Other

Garratt, M., & Stout, M. B. (2018). Hormone actions controlling sex-specific life-extension. Aging, 10(3), 293-294. doi: 10.18632/aging.101396

2017

Chapter in Book - Research

Gaillard, J.-M., Garratt, M., & Lemaître, J.-F. (2017). Senescence in mammalian life history traits. In R. P. Shefferson, O. R. Jones & R. Salguero-Gómez (Eds.), The evolution of senescence in the tree of life. (pp. 126-155). Cambridge, UK: Cambridge University Press. doi: 10.1017/9781139939867.007

Journal - Research Article

Garratt, M., Bower, B., Garcia, G. G., & Miller, R. A. (2017). Sex differences in lifespan extension with acarbose and 17-α estradiol: Gonadal hormones underlie male-specific improvements in glucose tolerance and mTORC2 signaling. Aging Cell, 16(6), 1256-1266. doi: 10.1111/acel.12656

Garratt, M., Nakagawa, S., & Simons, M. J. P. (2017). Life-span extension with reduced somatotrophic signaling: Moderation of aging effect by signal type, sex, and experimental cohort. Journals of Gerontology Series A, 72(12), 1620-1626. doi: 10.1093/gerona/glx010

Brooks, R. C., & Garratt, M. G. (2017). Life history evolution, reproduction, and the origins of sex-dependent aging and longevity. Annals of the New York Academy of Sciences, 1389(1), 92-107. doi: 10.1111/nyas.13302

Cady, G., Landeryou, T., Garratt, M., Kopchick, J. J., Qi, N., Garcia-Galiano, D., … Sadagurski, M. (2017). Hypothalamic growth hormone receptor (GHR) controls hepatic glucose production in nutrient-sensing leptin receptor (LepRb) expressing neurons. Molecular Metabolism, 6(5), 393-405. doi: 10.1016/j.molmet.2017.03.001

Ronget, V., Garratt, M., Lemaître, J.-F., & Gaillard, J.-M. (2017). The ‘evo-demo’ implications of condition-dependent mortality. Trends in Ecology & Evolution, 32(12), 909-921. doi: 10.1016/j.tree.2017.09.003

Journal - Research Other

Dantzer, B., & Garratt, M. (2017). Sex differences in telomeres and lifespan in Soay sheep: From the beginning to the end. Molecular Ecology, 26(12), 3090-3092. doi: 10.1111/mec.14129

2016

Journal - Research Article

Garratt, M., Kee, A. J., Palme, R., & Brooks, R. C. (2016). Male presence can increase body mass and induce a stress-response in female mice independent of costs of offspring production. Scientific Reports, 6(23538). doi: 10.1038/srep23538

Garratt, M., Nakagawa, S., & Simons, M. J. P. (2016). Comparative idiosyncrasies in life extension by reduced mTOR signalling and its distinctiveness from dietary restriction. Aging Cell, 15(4), 737-743. doi: 10.1111/acel.12489

2015

Journal - Research Article

Garratt, M., Lemaître, J.-F., Douhard, M., Bonenfant, C., Capron, G., Warnant, C., … Gaillard, J.-M. (2015). High juvenile mortality is associated with sex-specific adult survival and lifespan in wild roe deer. Current Biology, 25(6), 759-763. doi: 10.1016/j.cub.2014.11.071

Garratt, M., & Brooks, R. C. (2015). A genetic reduction in antioxidant function causes elevated aggression in mice. Journal of Experimental Biology, 218(2), 223-227. doi: 10.1242/jeb.112011

Gibson, A. B., Garratt, M., & Brooks, R. C. (2015). Experimental evidence that litter size imposes an oxidative challenge to offspring. Journal of Experimental Biology, 218(24), 3911-3918. doi: 10.1242/jeb.116327

2014

Journal - Research Article

Garratt, M., Pichaud, N., Glaros, E. N., Kee, A. J., & Brooks, R. C. (2014). Superoxide dismutase deficiency impairs olfactory sexual signaling and alters bioenergetic function in mice. PNAS, 111(22), 8119-8124. doi: 10.1073/pnas.1322282111

Journal - Research Other

Speakman, J. R., & Garratt, M. G. (2014). Oxidative stress as a cost of reproduction: Beyond the simplistic trade-off model. BioEssays, 36(1), 93-106. doi: 10.1002/bies.201300108

Garratt, M., Brooks, R. C., Lemaître, J.-F., & Gaillard, J.-M. (2014). Female promiscuity and maternally dependent offspring growth rates in mammals [Brief communication]. Evolution, 68(4), 1207-1215. doi: 10.1111/evo.12333

2013

Journal - Research Article

Garratt, M., Bathgate, R., de Graaf, S. P., & Brooks, R. C. (2013). Copper-zinc superoxide dismutase deficiency impairs sperm motility and in vivo fertility. Reproduction, 146(4), 297-304. doi: 10.1530/REP-13-0229

Pichaud, N., Garratt, M., Ballard, J. W. O., & Brooks, R. C. (2013). Physiological adaptations to reproduction. II. Mitochondrial adjustments in livers of lactating mice. Journal of Experimental Biology, 216(15), 2889-2895. doi: 10.1242/jeb.082685

Garratt, M., Pichaud, N., Aloise King, E. D., & Brooks, R. C. (2013). Physiological adaptations to reproduction. I. Experimentally increasing litter size enhances aspects of antioxidant defence but does not cause oxidative damage in mice. Journal of Experimental Biology, 216(15), 2879-2888. doi: 10.1242/jeb.082669

Aloise King, E. D., Garratt, M., & Brooks, R. (2013). Manipulating reproductive effort leads to changes in female reproductive scheduling but not oxidative stress. Ecology & Evolution, 3(12), 4161-4171. doi: 10.1002/ece3.786

Garratt, M., Gaillard, J.-M., Brooks, R. C., & Lemaître, J.-F. (2013). Diversification of the eutherian placenta is associated with changes in the pace of life. PNAS, 110(19), 7760-7765. doi: 10.1073/pnas.1305018110

Journal - Research Other

Gale, T., Gibson, A. B., Brooks, R. C., & Garratt, M. (2013). Exposure to a novel male during late pregnancy influences subsequent growth of offspring during lactation [Short communication]. Journal of Evolutionary Biology, 26(9), 2057-2062. doi: 10.1111/jeb.12192

2012

Journal - Research Article

Garratt, M., McArdle, F., Stockley, P., Vasilaki, A., Beynon, R. J., Jackson, M. J., & Hurst, J. L. (2012). Tissue-dependent changes in oxidative damage with male reproductive effort in house mice. Functional Ecology, 26(2), 423-433. doi: 10.1111/j.1365-2435.2011.01952.x

Journal - Research Other

Garratt, M., & Brooks, R. C. (2012). Oxidative stress and condition-dependent sexual signals: More than just seeing red. Proceedings of the Royal Society B, 279(1741), 3121-3130. doi: 10.1098/rspb.2012.0568

2011

Journal - Research Article

Garratt, M., Stockley, P., Armstrong, S. D., Beynon, R. J., & Hurst, J. L. (2011). The scent of senescence: Sexual signalling and female preference in house mice. Journal of Evolutionary Biology, 24(11), 2398-2409. doi: 10.1111/j.1420-9101.2011.02367.x

Garratt, M., Vasilaki, A., Stockley, P., McArdle, F., Jackson, M., & Hurst, J. L. (2011). Is oxidative stress a physiological cost of reproduction? An experimental test in house mice. Proceedings of the Royal Society B, 278(1708), 1098-1106. doi: 10.1098/rspb.2010.1818