When Diabetes meets Dementia: Understanding the link

How Diabetes can affect memory and thinking

Your brain needs a steady supply of blood and glucose to work well. When diabetes is not well managed, it can affect the brain in a few ways:

• Exposure to elevated blood glucose levels over time – This can damage the blood vessels, including those that supply the brain, and increase the risk of stroke and memory problems.
• Insulin changes - Insulin is the hormone that helps glucose move from the blood into the body’s cells to be used for energy. In some people, the body does not make enough insulin, and in others, the insulin does not work properly (called insulin resistance). When insulin isn’t working as it should, brain cells may not get or use glucose efficiently, which can affect how they communicate and function.
• Hypoglycaemia, or low levels of glucose in the blood - can occur as a side effect of some diabetes medications including insulin and a class of tablets known as sulfonylureas. Overtime, experiencing low levels of blood glucose frequently can impact your memory and thinking. This doesn’t mean you will develop dementia, but it does increase your risk.

Early signs matter

Changes in memory can happen for many reasons and this doesn’t always mean dementia. However, some of the warning signs include repeating the same questions; getting lost in familiar places; having difficulty following conversations or instructions; or noticeable changes in judgement, confidence, or personality.

How Dementia affect Diabetes care

Memory problems can make diabetes management more difficult. People may forget to take their medications or insulin, skip meals or eat at irregular times, find it hard to check blood glucose levels, or fail to recognize the warning signs of low blood glucose. Having strong support from family, carers, and healthcare professionals can make a huge difference.

Simple ways to protect your brain

You don’t need to be perfect; even small changes can help.  

Blood glucose stability is the key

Keeping blood glucose levels as steady as possible is especially important for brain health.

• Frequent swings between high and low blood glucose may stress the brain.
• Health professionals can adjust diabetes targets for people with memory problems to reduce the risk of low blood glucose. Speak with your diabetes health care team about ways to keep your glucose levels steady
• Consistent meal timing helps both memory and glucose management.
• Simplifying medication routines can reduce errors. Speak with your diabetes health care team about ways to manage your medication regimen. You may benefit from a review with a pharmacist.

Healthy habits for a healthy brain

Staying active, eating well, and making healthy lifestyle choices all work together to protect brain health. Staying active improves brain circulation and reduces the risk of memory loss. Walking, swimming, and gentle exercise classes are great options, while strength and balance exercises help people stay steady on their feet and independent for longer.

What you eat and drink also matters. As per the Australian Dietary Guidelines, a healthy diet includes food from 5 different core food groups: vegetables, whole grains, lean proteins, reduced-fat dairy or dairy alternatives and fruits. Cutting back on sugar-loaded drinks and sweets helps to stabilise your blood glucose levels, and drinking enough water will help you feel more alert and less tired.

Smoking and alcohol can increase the risk of memory problems. Quitting smoking and drinking alcohol in moderation, or not at all, is best for brain health and lowers the risk of dementia. 

Stay connected and look after your health

Spending time with people you care about or getting involved in community groups help to keep your mind active. Simple things like reading, solving puzzles, gardening or learning a new skill will give your brain a gentle work out. If you have been feeling lonely, anxious, or withdrawn for a while it is important that you to seek support from a healthcare professional.

Take care of your senses and sleep

Good sleep, clear vision, and proper hearing are all important for memory, focus, and independence. Poor sleep can worsen confusion and forgetfulness, while untreated vision or hearing problems can make daily tasks harder and increase mental strain. Wearing hearing aids and glasses when you need them can ease that mental strain. Also protecting your head during activities like cycling or other higher-risk tasks helps prevent brain injuries.

Planning ahead makes life easier

Thinking ahead can make daily life simpler and help people stay independent for longer. Often, it is the everyday habits, like a pill organiser, or setting up a simple alarm, or writing down your appointments and emergency contacts, that help the most. Involving trusted family members early on also helps share the load, so no one feels like they’re carrying everything on their own.

Support Is a strength, not a weakness

Living well with diabetes and memory changes is not something anyone should have to manage alone. It is a team effort. When family, friends, and health professionals come together, everyday life feels safer and less overwhelming.

What it all comes down to

Living with diabetes does not mean losing your memory, independence, or quality of life. With the right support, smart self-care, and early action, people can continue to live full, active, and meaningful lives.

Healthy habits don’t just add years to life; they add life to your years!