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Rachel V Thomas

Brain Health After 40: How Diabetes, Menopause And Early Detection Affect Dementia Risk | World Alzheimer’s Day

Alzheimer’s disease and dementia are often viewed as diseases of old age, with <span>memory loss</span> considered one of their most recognizable symptoms. However, emerging research increasingly points to factors such as diabetes, blood pressure, hormonal changes and lifestyle during midlife, particularly from the 40s onward, that may influence the risk of <span>cognitive decline</span> later in life.

As ageing populations worldwide face a growing dementia burden, doctors are emphasizing the importance of identifying and addressing these risks in midlife. Alzheimer’s disease is a progressive brain disorder that affects memory, thinking and the ability to manage everyday life.

<strong><em>HealthandMe </em></strong>spoke to doctors about the disproportionate burden of Alzheimer’s among women, the link between diabetes and accelerated brain ageing, and how disease-modifying treatments such as <span>lecanemab</span> are changing the treatment landscape. They also highlighted the importance of early assessment to identify cognitive problems that families may otherwise dismiss as normal ageing.

<h2>Diabetes And The Ageing Brain: The Quiet Connection</h2>

Type 2 diabetes is an important modifiable factor associated with accelerated brain ageing, making cognitive health an important part of diabetes care.

Dr. V. Mohan, Managing Director, Dr Mohan’s Diabetes Specialities Centre and President, Madras Diabetes Research Foundation, told <strong><em>HealthandMe </em></strong>that every diabetes appointment follows a familiar rhythm: check blood sugar, examine the feet, check the eyes, review the heart and kidneys, and renew the prescription. But the brain, more often than not, receives little attention.

Research suggests that type 2 diabetes is associated with accelerated brain ageing, while vascular damage linked to high blood sugar, blood pressure and cholesterol can affect the brain as well as the heart, kidneys and eyes.

The 2024 Lancet Commission on dementia prevention, intervention and care identified diabetes as one of 14 modifiable risk factors associated with nearly half of dementia cases worldwide.

“The message is simple: just as people routinely check their blood pressure, blood sugar, eyes, feet and kidneys, cognitive health deserves attention too,” he said, while suggesting ABCD for Protecting Brain Health in Diabetes:

<strong>A – </strong>Aim for HbA1c Control

<strong>B – </strong>Blood Pressure Control

<strong>C – </strong>Control Cholesterol

<h2>Why Menopause Matters For Women’s Brain Health</h2>

Women carry a disproportionate burden of Alzheimer’s disease. According to Stanford, roughly three women are diagnosed with Alzheimer’s for every two men, while data from the Framingham Heart Study cited by the 

Alzheimer’s Association estimated that at age 45, the lifetime risk of developing clinical Alzheimer’s dementia was about 20% for women compared with 10% for men.

Dr. Anmol Singh Rai, Consultant Neurology, Fortis Hospital Jalandhar, pointed out several factors that may contribute to this difference. He noted:

<ul><li><strong>APOE4 is one important factor.</strong> In women, the gene variant has been associated with a greater increase in dementia risk than in men.</li><li><strong>Age is another major factor,</strong> with dementia risk rising sharply in older age groups. Since women generally live longer, more women reach the ages when dementia becomes increasingly common.</li><li><strong>Hormonal changes may also play a role.</strong> Declining estrogen during menopause can affect brain metabolism and neuronal health, making the menopausal transition an important period for paying attention to cognitive and overall health.</li></ul>To curb the growing risk, Dr. Anmol stressed the need to begin “prevention well before old age”.

“Managing blood pressure, blood sugar and cholesterol, addressing hearing loss, identifying sleep apnea, staying physically active and addressing depression and social isolation can all form part of a broader approach to brain health,” he told <strong><em>HealthandMe</em></strong>.

<h2>Alzheimer’s: Why Early Detection Matters As Treatment Advances</h2>

More than 55 million people worldwide live with dementia today, with a new case developing every three seconds. This number is projected to rise to 139 million by 2050.

With the arrival of disease-modifying treatments such as <span>Leqembi</span> (lecanemab), the importance of identifying cognitive decline early has become even greater.

"For three decades, Alzheimer's treatment has leaned on drugs that modestly improve cognition, function and behavior, buying patients and caregivers meaningful time. But none of them alter the underlying biology of the disease," Dr. Praveen Gupta, Chairman, Marengo Asia International Institute for Neuro and Spine (MAIINS), Marengo Asia Hospitals, Gurugram, told <strong><em>HealthandMe</em></strong>.

The disease-modifying therapy for Alzheimer’s, Leqembi, was cleared in the US in 2023, followed by Japan the same year, China in June 2024, the European Union in 2025, and India in August 2026.

"Unlike everything that came before it, lecanemab is designed to act on the pathological process itself, not merely its downstream consequences," Dr. Praveen Gupta said.

However, the treatment is not meant for everyone with Alzheimer’s. It is approved for early Alzheimer’s disease, including mild cognitive impairment and mild dementia, rather than moderate or advanced disease.

That makes timely diagnosis particularly important.

"Patient selection now hinges on confirming amyloid pathology, through cerebrospinal fluid analysis or blood-based biomarkers, before treatment even begins," Dr. Praveen Gupta explained.

<h2>Brain Health Should Begin Before Memory Loss</h2>

The experts noted that brain health is not something that needs attention only after memory loss begins. 

Midlife is an important window to control blood pressure, blood sugar and cholesterol, remain physically active, address hearing and sleep problems, and pay attention to changes in memory or thinking.

For people already showing cognitive symptoms, early medical assessment can help distinguish normal ageing from mild cognitive impairment, dementia or potentially treatable conditions.

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Alzheimer’s disease and dementia are often viewed as diseases of old age, with memory loss considered one of their most recognizable symptoms. However, emerging research increasingly points to factors such as diabetes, blood pressure, hormonal changes and lifestyle during midlife, particularly from the 40s onward, that may influence the risk of cognitive decline later in life.As ageing populations worldwide face a growing dementia burden, doctors are emphasizing the importance of identifying and addressing these risks in midlife. Alzheimer’s disease is a progressive brain disorder that affects memory, thinking and the ability to manage everyday life.HealthandMe spoke to doctors about the disproportionate burden of Alzheimer’s among women, the link between diabetes and accelerated brain ageing, and how disease-modifying treatments such as lecanemab are changing the treatment landscape. They also highlighted the importance of early assessment to identify cognitive problems that families may otherwise dismiss as normal ageing.Diabetes And The Ageing Brain: The Quiet ConnectionType 2 diabetes is an important modifiable factor associated with accelerated brain ageing, making cognitive health an important part of diabetes care.Dr. V. Mohan, Managing Director, Dr Mohan’s Diabetes Specialities Centre and President, Madras Diabetes Research Foundation, told HealthandMe that every diabetes appointment follows a familiar rhythm: check blood sugar, examine the feet, check the eyes, review the heart and kidneys, and renew the prescription. But the brain, more often than not, receives little attention.Research suggests that type 2 diabetes is associated with accelerated brain ageing, while vascular damage linked to high blood sugar, blood pressure and cholesterol can affect the brain as well as the heart, kidneys and eyes.The 2024 Lancet Commission on dementia prevention, intervention and care identified diabetes as one of 14 modifiable risk factors associated with nearly half of dementia cases worldwide.“The message is simple: just as people routinely check their blood pressure, blood sugar, eyes, feet and kidneys, cognitive health deserves attention too,” he said, while suggesting ABCD for Protecting Brain Health in Diabetes:A – Aim for HbA1c ControlB – Blood Pressure ControlC – Control CholesterolD – Diet ManagementWhy Menopause Matters For Women’s Brain HealthWomen carry a disproportionate burden of Alzheimer’s disease. According to Stanford, roughly three women are diagnosed with Alzheimer’s for every two men, while data from the Framingham Heart Study cited by the Alzheimer’s Association estimated that at age 45, the lifetime risk of developing clinical Alzheimer’s dementia was about 20% for women compared with 10% for men.Dr. Anmol Singh Rai, Consultant Neurology, Fortis Hospital Jalandhar, pointed out several factors that may contribute to this difference. He noted:APOE4 is one important factor. In women, the gene variant has been associated with a greater increase in dementia risk than in men.Age is another major factor, with dementia risk rising sharply in older age groups. Since women generally live longer, more women reach the ages when dementia becomes increasingly common.Hormonal changes may also play a role. Declining estrogen during menopause can affect brain metabolism and neuronal health, making the menopausal transition an important period for paying attention to cognitive and overall health.To curb the growing risk, Dr. Anmol stressed the need to begin “prevention well before old age”.“Managing blood pressure, blood sugar and cholesterol, addressing hearing loss, identifying sleep apnea, staying physically active and addressing depression and social isolation can all form part of a broader approach to brain health,” he told HealthandMe.Alzheimer’s: Why Early Detection Matters As Treatment AdvancesMore than 55 million people worldwide live with dementia today, with a new case developing every three seconds. This number is projected to rise to 139 million by 2050.With the arrival of disease-modifying treatments such as Leqembi (lecanemab), the importance of identifying cognitive decline early has become even greater."For three decades, Alzheimer's treatment has leaned on drugs that modestly improve cognition, function and behavior, buying patients and caregivers meaningful time. But none of them alter the underlying biology of the disease," Dr. Praveen Gupta, Chairman, Marengo Asia International Institute for Neuro and Spine (MAIINS), Marengo Asia Hospitals, Gurugram, told HealthandMe.The disease-modifying therapy for Alzheimer’s, Leqembi, was cleared in the US in 2023, followed by Japan the same year, China in June 2024, the European Union in 2025, and India in August 2026."Unlike everything that came before it, lecanemab is designed to act on the pathological process itself, not merely its downstream consequences," Dr. Praveen Gupta said.However, the treatment is not meant for everyone with Alzheimer’s. It is approved for early Alzheimer’s disease, including mild cognitive impairment and mild dementia, rather than moderate or advanced disease.That makes timely diagnosis particularly important."Patient selection now hinges on confirming amyloid pathology, through cerebrospinal fluid analysis or blood-based biomarkers, before treatment even begins," Dr. Praveen Gupta explained.Brain Health Should Begin Before Memory LossThe experts noted that brain health is not something that needs attention only after memory loss begins. Midlife is an important window to control blood pressure, blood sugar and cholesterol, remain physically active, address hearing and sleep problems, and pay attention to changes in memory or thinking.For people already showing cognitive symptoms, early medical assessment can help distinguish normal ageing from mild cognitive impairment, dementia or potentially treatable conditions.

brain health after 40: why diabetes, menopause and early detection matter | world alzheimer’s day

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