This should include sex hormones, thyroid function, cortisol rhythm, and vitamin D levels at minimum. If cognitive symptoms are pronounced, persistent, or significantly affecting quality of life, a thorough hormonal panel is a sensible starting point. While some hormonal changes are inevitable features of biological aging, the trajectory, timing, and cognitive impact of those changes are all meaningfully influenced by lifestyle, nutritional status, and in some cases medical intervention. Similarly, in T4DM, testosterone treatment improved sexual function, and also improved volumetric bone mineral density predominantly via effects on cortical bone 127, 132. Therefore, testosterone treatment in conjunction with lifestyle intervention, addresses two key factors predisposing to dementia, namely obesity and diabetes, but its effect on dementia risk remains unproven. Whether such lifestyle interventions combined with testosterone treatment might protect against both type 2 diabetes and cognitive decline, remains unclear. These methods work through daily lifestyle choices that help balance hormones and keep the brain healthy. MRI brain scans might help too, especially to examine the frontal and temporal lobes that change differently in various types of cognitive decline48. Executive function serves as the brain's management system for planning, decision-making, and self-regulation. Used thoughtfully alongside the lifestyle foundations, these can meaningfully support the brain through hormonal transitions. Lion’s mane mushroom supports nerve growth factor production relevant to maintaining the neural plasticity that hormonal decline tends to erode. Adequate healthy fat intake, including omega-3 fatty acids and cholesterol, is necessary for steroid hormone production. Every major hormonal system relevant to cognitive aging is either supported or undermined by the quality of sleep it operates within. Growth hormone is released primarily during slow-wave sleep, and testosterone production follows a circadian rhythm that depends heavily on sleep duration and consistency. Aerobic exercise, meanwhile, supports estrogen metabolism, reduces cortisol over time, and promotes the cerebral blood flow and BDNF production that help maintain the neural structures most vulnerable to hormonal decline. Exercise is recommended as part of the management of type 2 diabetes, and may help to ameliorate dementia risk in that setting 124, 125. Of note, there is a bidirectional association of obesity with lower testosterone concentrations in middle-aged to older men 3, 4. Diabetes mellitus is a recognised risk predictor for the development of dementia and dementia due to Alzheimer disease 20, 116–118. The APOE Ɛ4 allele is a key genetic risk factor for late-onset Alzheimer’s disease, and an interaction between free testosterone and APOE Ɛ4 genotype has been reported . When the 247 testosterone-treated men were compared to the 246 placebo recipients, there was no effect of testosterone on tests of verbal and visual memory, executive function, or spatial ability, at either 6 or 12 months. However, in that sub-study the groups were unbalanced, with men in the placebo group having substantially more plaque at baseline and at the end of the study, posing a challenge when interpreting the results . Testosterone treated men gained on average 0.39 kg of muscle mass and lost 4.6 kg of fat, whereas placebo treated men lost 1.3 kg of muscle mass and 1.9 kg of fat. Intensive lifestyle interventions aimed at reducing excess weight with a combination of dietary changes and increasing physical activity levels are effective at preventing type 2 diabetes 122, 123. It is also possible that combining testosterone with a lifestyle intervention, may provide a more informative clinical trial strategy 98, 111, 112.
