Type 2 diabetes: continuous monitoring

The day-to-day lives of people living with type 2 diabetes has changed significantly thanks to advances in modern technology. One big game-changer in this regard is the Continuous Glucose Monitoring (CGM), which enables continuous and dynamic monitoring of interstitial glucose levels. Unlike traditional monitoring with fingersticks, which measures blood glucose, CGM offers a comprehensive and ongoing 24-hour view of how your blood glucose behaves^1,6.

This tool not only makes early detection of episodes of hypoglycaemia and hyperglycaemia much easier, but also empowers patients, fosters health education and enables health professionals to make more informed decisions about treatment.^1,2,6

What is CGM and how does it work?

CGM consists of a small sensor placed under the skin, usually in the abdomen or arm. The sensor measures glucose levels in the interstitial fluid every few minutes. This data is sent to the receiving device or a phone, where it is shown with graphs, trends and alerts in real time^1,2,6.

The main advantage of this system is that it enables you to observe patterns that a traditional glucometer cannot detect, such as glucose spikes after meals or drops at night. This option is especially important for people with type 2 diabetes, in which glucose can fluctuate significantly according to diet, physical activity and medication.

Some modern CGM systems also include predictive alerts that warn users before glucose reaches dangerous levels, helping to anticipate episodes of hypoglycaemia. CGM is associated with improved glycaemic metrics, which are linked to a lower risk of long-term complications^2,6.

Benefits of CGM in type 2 diabetes

1. Improved glycaemic monitoring

Several studies have shown that using CGM improves glycaemic control and reduces the risk of complications, a key indicator in diabetes management^3,6. For example, one randomised clinical trial showed that after 24 weeks, patients with type 2 diabetes who used CGM reduced their HbA1c from 8.5 % to 7.7 %, while the group that used conventional monitoring only achieved a reduction of 8.0 %^3,6.

This benefit not only reflects better management of daily glucose, but is also associated with a reduced risk of long-term complications such as cardiovascular diseases, neuropathy and kidney damage^3,6.

2. Silent peaks and troughs detected

CGM can detect unobserved hypoglycaemias and post-postprandial peaks, which can go unnoticed with more sporadic measurements²,³,6. For example, a person living with diabetes can detect that their glucose rises significantly after a high-carb breakfast, which enables them to change their diet or their treatment regimen before symptoms appear.

Detailed information like this also helps medical professionals to personalise treatment, enabling them to evaluate any need for changes to medication, times of administration and dietary changes^2,6.

3. Empowerment and education 

One of the most important advantages of CGM is their capacity to promote self-management and health education¹,²evaluate any need for changes to medication, times of administration and dietary changes²,. By receiving real-time data, people living with diabetes can observe how factors such as physical activity, sleep quality and diet can affect their glucose levels.

This constant learning process encourages adhesion to Healthy habits and physical activity are essential to maintain good glycaemic control in type 2 diabetes.^1.2,6.

4. Personalised medical support

Detailed reports generated by CGM enable health professionals to make decisions based on solid evidence, enabling them to optimise treatment and reduce dependence on frequent capillary tests^2,3,6. This is especially useful for people with advanced type 2 diabetes, where therapeutic needs can change with time and progression of the condition.

5. Economic impact and clinical recognition

CGM not only improves glycaemic management and quality of life, it is also cost-effective in the long term⁴,⁵. Some countries are now implementing policies to make these devices available to people with type 2 diabetes because of their capacity to reduce serious complications and hospitalisations. Some studies also show that better glucose management reduces associated medical costs^4,5,6.

Challenges and limitations

Despite its many benefits, CGM faces a lot of challenges:

• Price and coverage: CGM systems in many countries are not completely covered by national health systems or medical insurance, which raises barriers to access⁴,⁵.
• Technological adoption: some people may find it difficult to adapt to this new technology, although modern devices are increasingly intuitive.^2,6

Perception of need: there is a persistent belief that this technology is exclusively for type 1 diabetes, but current evidence shows that it is also useful for type 2 diabetes^1,2,6.

Future perspectives

The future of CGM is geared towards deeper integration with mobile applications and AI algorithms, which could predict glycaemic tendencies and suggest automatic adjustments in real time.4,5,6 The hope is that with reduced costs and increased coverage, CGM could become a standard tool in type 2 diabetes, democratising access to safer and more effective management.