Quick answer: Insulin resistance is when the body’s cells stop responding well to insulin, the hormone that moves sugar from the blood into cells for energy. To compensate, the body makes more and more insulin. Over time this can lead to prediabetes and type 2 diabetes, and it is linked with high blood pressure, unhealthy cholesterol, fatty liver, PCOS and heart disease. The encouraging news is that it can often be improved, and sometimes reversed, with lifestyle changes. In Singapore, a GP can help you assess your risk and, where needed, refer you to an endocrinologist.
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Insulin resistance is one of the most important, yet least visible, drivers of poor metabolic health. It usually builds up quietly over years and often causes no symptoms, so many people never realise it is happening. Understanding what it is and how it can be improved puts you in a strong position to protect your long-term health.
What insulin resistance is
Insulin is a hormone made by the pancreas. After you eat, it acts like a key that lets sugar (glucose) move out of the bloodstream and into your cells, where it is used for energy. In insulin resistance, the cells do not respond well to this signal. To keep blood sugar normal, the pancreas works harder and releases more and more insulin. For a while this keeps things balanced, but over time the pancreas may struggle to keep up. When it can no longer make enough, blood sugar begins to rise, first into the prediabetes range and later into type 2 diabetes.
Why it matters
Insulin resistance sits at the root of prediabetes and type 2 diabetes, but its effects reach further. It is closely linked with high blood pressure, unhealthy cholesterol levels, fatty liver, polycystic ovary syndrome (PCOS) and a raised risk of heart disease and stroke. When several of these problems cluster together, doctors often describe the picture as “metabolic syndrome”. Because these conditions share a common thread, improving insulin resistance can benefit many aspects of your health at once. Tackling it early is one of the most effective ways to lower your future risk of diabetes and heart disease.
Symptoms and signs
Insulin resistance often has no symptoms at all, which is why it is easy to miss. It is usually found through its effects rather than felt directly. Possible clues include gaining weight around the middle, feeling tired, and a skin change called acanthosis nigricans, in which the skin becomes darker and velvety in body folds such as the neck, armpits or groin. Some people also notice skin tags. These signs are not proof on their own, but they are worth mentioning to your doctor, especially if you have other risk factors.
Causes and risk factors
Several things make insulin resistance more likely. Carrying excess weight, particularly around the abdomen, is one of the strongest factors. Physical inactivity, a diet high in sugary drinks, refined carbohydrates and heavily processed foods, and a family history of type 2 diabetes all add to the risk. Certain conditions, such as PCOS and fatty liver, and some medicines can contribute too. Importantly, people of Asian ethnicity can develop insulin resistance at a lower body weight than other groups, which is very relevant in Singapore. This means you should not assume you are in the clear simply because you look slim; risk can be present even without obvious excess weight.
How it is assessed
There is no single simple test that is used routinely to diagnose insulin resistance on its own. Instead, doctors usually infer it from a combination of blood sugar tests, related blood results such as cholesterol, and clinical features like waist size, blood pressure and skin changes. Your GP will look at the whole picture, including your family history and lifestyle, to judge how likely insulin resistance is and what it might already be causing. If the situation is complex, or if diabetes or PCOS is suspected, you may be referred to an endocrinologist for further assessment.
How to improve it: the good news
Here is the encouraging part. Insulin resistance can often be improved, and in many cases reversed, through everyday changes. Losing even a modest amount of weight, becoming more physically active, eating a healthier diet, sleeping better and treating related conditions such as high blood pressure can all make the cells respond to insulin more effectively. In some cases, a doctor may also prescribe medicines to help. Because the condition responds so well to these steps, small, steady changes that you can keep up over time tend to work best.
Practical steps
You do not need a dramatic overhaul to make progress. A few realistic, Singapore-friendly habits can go a long way:
- Move more each day. Brisk walking, taking the stairs, swimming or joining a community exercise session all count. Aim to reduce long stretches of sitting.
- Choose wholegrains where you can, such as brown rice or wholemeal options, and build meals around vegetables, lean protein and beans.
- Cut back on sugary drinks. Order kopi or teh kosong, or choose the lower-sugar options many hawker stalls now display.
- Watch portion sizes of rice, noodles and other refined carbohydrates, and add more vegetables to your plate.
- Prioritise good sleep and manage stress, both of which affect how your body handles sugar.
- Attend health screening. The Health Promotion Board encourages eligible residents to check their metabolic health so problems can be caught early.
When to see a doctor
It is worth speaking with a GP if you have risk factors such as a family history of diabetes, excess weight around the middle, PCOS, high blood pressure or the skin changes described above. Assessment is especially sensible for those of Asian ethnicity, who can be affected at a lower weight. Managing insulin resistance early lowers your risk of going on to develop type 2 diabetes and heart disease, so it is well worth acting sooner rather than later. Your doctor can arrange the right checks, offer personalised guidance and refer you to an endocrinologist if needed.
Common questions
Can insulin resistance be reversed?
In many people it can be improved and sometimes reversed, especially when it is caught early. Losing some weight, being more active, eating better and sleeping well can help the cells respond to insulin again. The earlier you start, the better the results tend to be.
Is insulin resistance the same as diabetes?
No. Insulin resistance is an earlier stage in which the cells respond poorly to insulin but blood sugar may still be normal because the body makes extra insulin. If it progresses, it can lead to prediabetes and then type 2 diabetes. This is why acting early matters.
Can I have insulin resistance even if I am not overweight?
Yes. While excess weight raises the risk, people of Asian ethnicity can develop insulin resistance at a lower body weight. This is very relevant in Singapore, so it is worth being assessed if you have other risk factors, even if you look slim.
How do I know if I have it?
There is no single routine test. A GP usually judges it from your blood sugar and related blood results, your waist size, blood pressure, family history and any skin changes. If you are concerned, book a check with your GP or take part in health screening.
Does insulin resistance always cause symptoms?
Often it causes none, which is why it can go unnoticed for years. Some people notice tiredness, weight gain around the middle or darkened, velvety skin in body folds, but many feel completely well. This is why screening for those at risk is so useful.
Related guides
Sources
- Health Promotion Board
- HealthHub
- Diabetes Singapore
- NHS
Disclaimer: This guide is for general information only and is not a substitute for professional medical advice. It cannot address your individual circumstances. If you have concerns about your metabolic health or risk of diabetes, please speak with a GP or a qualified healthcare professional in Singapore.