Type 2 Diabetes: How to Recognize It and When to See a Doctor

Last medically reviewed: July 31, 2026. Reading time: approx. 8 minutes

Type 2 diabetes is the most common form of diabetes in adults - it develops over years, usually without clear-cut symptoms. Diagnosis relies on three blood tests: fasting glucose, the oral glucose tolerance test (OGTT), and glycated hemoglobin (HbA1c). At the Lekarze Medical Center in Warsaw, the full screening panel can be completed during a single visit to an internist, without a referral.

In this article

1. What is type 2 diabetes and how does it differ from type 1?
2. What are the first symptoms of type 2 diabetes?
3. Who is at increased risk?
4. Which tests can diagnose type 2 diabetes?
5. What is prediabetes?
6. How can you reduce the risk of developing type 2 diabetes?
7. What does type 2 diabetes treatment look like?
8. When should you see a doctor in Warsaw?
9. Frequently asked questions

What is type 2 diabetes and how does it differ from type 1?

In a healthy body, insulin - a hormone produced by the pancreas - allows glucose to move from the blood into muscle, liver, and fat cells, where it becomes a source of energy. In type 2 diabetes, these cells gradually lose their sensitivity to insulin. This phenomenon is called insulin resistance. For a while, the pancreas compensates by secreting larger amounts of insulin, but over time its capacity becomes exhausted and blood glucose levels begin to persistently exceed the normal range.

Type 2 diabetes differs from type 1 in both mechanism and course. Type 1 results from the immune system destroying the pancreas's own cells, is usually diagnosed in childhood or early adulthood, and requires insulin therapy from the outset. Type 2 accounts for more than 90% of all diabetes cases, develops mainly in adults, and can often be managed without insulin for a long time.

What are the first symptoms of type 2 diabetes?

Type 2 diabetes develops stealthily - the first years often pass without noticeable complaints. When symptoms do appear, they most often involve increased thirst, more frequent urination (especially at night), chronic fatigue, and blurred vision. Recurring skin and urinary tract infections, as well as slower wound healing, are also characteristic.

Some patients notice changes in body weight - difficulty losing kilograms despite dieting, or, less often, unintentional weight loss.

"These signals are nonspecific and are often attributed to age or stress for many months - which is why type 2 diabetes is most often diagnosed incidentally, during routine check-ups." — Dr. Tetiana Ivasenko

If any of these symptoms persist for more than a few weeks, it's worth checking your blood glucose level.

Who is at increased risk?

The risk of developing type 2 diabetes increases with age and rises further when several factors occur together. The most important ones include overweight and obesity, especially abdominal obesity - waist circumference above 88 cm in women and 102 cm in men - low physical activity, a diet rich in simple sugars and highly processed foods, and chronic stress combined with persistent sleep deprivation.

Family history has a significant influence - type 2 diabetes in a parent or sibling increases the risk several times over. Medical risk factors also include arterial hypertension, lipid disorders (elevated triglycerides, lowered HDL cholesterol), polycystic ovary syndrome (PCOS) in women, and a history of gestational diabetes. People over 45 with at least one of these factors should have their glucose tested at least once a year - even in the absence of any symptoms.

Which tests can diagnose type 2 diabetes?

A diagnosis of type 2 diabetes is based on the results of one of three blood tests, performed according to current guidelines of the Polish Diabetes Association (Polskie Towarzystwo Diabetologiczne). An abnormal result always requires confirmation with a second, independent measurement.

Fasting glucose

The basic screening test, taken after at least eight hours of fasting. A normal result is below 100 mg/dl. Values between 100 and 125 mg/dl indicate prediabetes, while a result equal to or higher than 126 mg/dl, confirmed by a second measurement, meets the criterion for a diabetes diagnosis.

Oral glucose tolerance test (OGTT)

Commonly known as the glucose tolerance curve. The patient arrives fasting and drinks 75 g of glucose dissolved in water; blood sugar is then measured after two hours. Values between 140 and 199 mg/dl at the two-hour mark indicate impaired glucose tolerance, while a result equal to or higher than 200 mg/dl confirms type 2 diabetes.

Glycated hemoglobin (HbA1c)

Reflects average blood glucose levels over the past two to three months. Fasting is not required. A result equal to or higher than 6.5% meets the criterion for a diabetes diagnosis.

At the {Clinic Name} clinic in Warsaw, all three tests can be performed on-site, and a follow-up consultation with an internist to discuss the results is usually scheduled shortly after they become available.

What is prediabetes?

Prediabetes refers to elevated blood glucose levels that do not yet meet the criteria for diabetes but significantly increase the risk of developing it in the coming years. There are two forms: impaired fasting glucose (glucose 100–125 mg/dl) and impaired glucose tolerance (140–199 mg/dl at the two-hour mark of the OGTT).

"Prediabetes is not yet a disease, but it is a window in which lifestyle intervention can completely reverse the process." — Dr. {Name Surname}

The large Diabetes Prevention Program clinical trial (2002) showed that losing 5–7% of body weight combined with regular physical activity reduces the risk of developing full-blown diabetes by more than half in people with impaired glucose tolerance. Regular glucose monitoring in patients with prediabetes allows for early intervention before the disease develops.

How can you reduce the risk of developing type 2 diabetes?

Prevention of type 2 diabetes is based on several well-documented lifestyle changes. Weight reduction in people who are overweight matters most - even a modest weight loss of 5-7% clearly improves carbohydrate metabolism and reduces insulin resistance.

Regular physical activity is equally important. Guidelines recommend at least 150 minutes of moderate exercise per week - brisk walking, cycling, swimming - ideally spread over several days. Even a short walk after a meal has a beneficial effect on glycemic control.

In everyday diet, it's worth limiting simple sugars (especially sweetened drinks and sweets), and increasing the share of vegetables, whole-grain products, and healthy fats: olive oil, nuts, and sea fish. Sleeping less than six hours a night is associated with worsened glucose tolerance - rest is part of prevention, not a luxury. Quitting smoking and limiting alcohol round out the picture.

People in risk groups should additionally have a blood test panel done once a year as part of preventive check-ups, even in the absence of symptoms.

What does type 2 diabetes treatment look like?

Treatment of type 2 diabetes is chosen individually and depends on how advanced the disease is, the patient's age, and the presence of complications. The first step is always a lifestyle change - diet, physical activity, and weight reduction. In many patients at an early stage, these measures alone are enough to normalize results.

When lifestyle changes alone don't bring glucose levels to target, the doctor introduces pharmacological treatment. The first-line standard therapy is metformin, to which other oral medications may later be added. Newer drug classes, such as SGLT2 inhibitors (gliflozins) and GLP-1 receptor agonists, additionally have a beneficial effect on body weight and cardiovascular risk. Insulin therapy is introduced in more advanced stages of the disease or when oral medications are no longer effective.

Regular follow-up visits with an internist or diabetologist, along with HbA1c testing every 3-6 months, help keep the disease under control and prevent cardiovascular, kidney, and vision complications.

When should you see a doctor in Warsaw?

A consultation is warranted if any of the symptoms described above persist for more than two to three weeks, if you belong to a risk group (overweight, age over 45, family history, PCOS, history of gestational diabetes), or if elevated glucose is found incidentally during routine tests.

At the Lekarze Medical Center in Warsaw, an internist consultation includes a medical history review, a physical examination, and ordering the full screening panel for type 2 diabetes. The visit takes place without a referral, and results can be discussed during a follow-up in-person visit or via a teleconsultation.

Note: if symptoms are severe - intense thirst, marked weakness, nausea, vomiting, confusion, or rapid breathing - don't wait for a clinic appointment; go to the nearest emergency department immediately or call 999.

Frequently asked questions

Is type 2 diabetes reversible?

In many cases, especially at an early stage of the disease, achieving remission is possible. Losing 10-15% of body weight combined with regular physical activity and changed eating habits allows some patients to stop medication and maintain normal glucose results. The decision to attempt remission is always made together with the treating physician and requires regular glucose monitoring.

How much does a glucose and HbA1c test cost in Warsaw?

The price list is available before booking a visit. A full panel including fasting glucose, HbA1c, and a lipid profile can be completed during a single visit to an internist, without a referral. Results are discussed during a follow-up in-person visit or via a teleconsultation.

Do I need to fast for the HbA1c test?

No. Glycated hemoglobin (HbA1c) reflects average blood glucose levels over the past two to three months and can be measured at any time of day, regardless of meals. An eight-hour fast, however, is required for fasting glucose testing and for the oral glucose tolerance test (OGTT).

How should I prepare for the OGTT (glucose tolerance curve)?

For the oral glucose tolerance test, the patient arrives fasting - after at least eight hours without food. For the three days preceding the test, a normal, varied diet should be followed, without restricting carbohydrates. During the test - which takes two hours - the patient stays at the Lekarze Medical Center in Warsaw, since blood is drawn before drinking the glucose solution and again two hours after drinking it.

Is type 2 diabetes hereditary?

Type 2 diabetes has a strong genetic component - having the disease in a parent or sibling increases the risk of developing it several times over. However, this does not mean the disease is inevitable. Lifestyle - diet, physical activity, maintaining a healthy body weight - remains the strongest factor over which the patient has direct control. People with a family history should have their glucose tested at least once a year.

What is the difference between insulin resistance and type 2 diabetes?

Insulin resistance is a reduced sensitivity of cells to the action of insulin. It is not a disease but a metabolic state which, if uncorrected, can eventually lead to prediabetes and then to full-blown type 2 diabetes. Diagnosing insulin resistance involves assessing fasting glucose and insulin levels and calculating the HOMA-IR index.

Does excess sugar in the diet directly cause diabetes?

Sugar in the diet does not directly cause type 2 diabetes on its own, but an excess of simple sugars - especially from sweetened drinks and processed snacks - leads to weight gain and insulin resistance, and indirectly increases the risk of developing the disease. Moderate sugar consumption within a balanced diet rich in vegetables and whole grains is not dangerous in itself.

How often should people at risk get their glucose checked?

People over 45, as well as younger people with at least one risk factor (overweight, hypertension, family history, PCOS, history of gestational diabetes), should have fasting glucose or HbA1c tested at least once a year. At the Lekarze Medical Center in Warsaw, such a test can be included in the annual preventive panel performed during a single visit to an internist.

How do I book an appointment with an internist at the clinic?

An appointment with an internist at the Lekarze Medical Center in Warsaw can be booked by phone at +48 730 002 888 or through the online form on the website. No referral is required. During a single visit, the full screening panel for type 2 diabetes can be ordered, with results discussed at a follow-up appointment, either in person or via teleconsultation.

Book an internist consultation in Warsaw

At the Lekarze Medical Center in Warsaw, you can get the full type 2 diabetes screening panel done during a single visit, without a referral. Consultations are available in Polish, Ukrainian, Belarusian, and Russian.

Last medically reviewed: July 31, 2026

Sources: Clinical recommendations for the management of patients with diabetes - Polish Diabetes Association (current 2026 guidelines); Diabetes Prevention Program Research Group, "Reduction in the Incidence of Type 2 Diabetes with Lifestyle Intervention or Metformin," New England Journal of Medicine 2002.

This article is for educational purposes only and does not replace a medical consultation. If you have symptoms or concerns, please consult a doctor.