Diabetes is a chronic condition that changes how your body turns food into energy, and it now affects hundreds of millions of people around the world. When you have diabetes, glucose (blood sugar) builds up in your bloodstream because your body either does not make enough insulin or cannot use it properly. Over many years, unmanaged high blood sugar can quietly strain the heart, kidneys, eyes, and nerves. The reassuring part is that diabetes is measurable, trackable, and highly manageable with the right information and lab tests. In this article you will learn what diabetes is, the main types, the causes and symptoms, how it is diagnosed with blood tests, the treatments that keep blood sugar in range, and the newest scientific advances shaping care today.
What is diabetes?
Diabetes, known in full as diabetes mellitus, is a group of conditions marked by persistently high blood sugar. Your body breaks food down into glucose, which travels in the blood and fuels your cells. A hormone called insulin, made by the pancreas, acts like a key that lets glucose move out of the blood and into cells. In diabetes, that system breaks down: either the pancreas makes too little insulin, or the body stops responding to it. Glucose then stays in the blood instead of feeding your cells.
Doctors group diabetes into a few main types, and telling them apart guides treatment.
Type 1 diabetes
Type 1 diabetes is an autoimmune condition, meaning the immune system mistakenly attacks and destroys the insulin-making cells in the pancreas. People with type 1 make little or no insulin and need insulin every day to survive. It often appears in childhood or young adulthood but can start at any age. Type 1 accounts for a smaller share of cases than type 2.
Type 2 diabetes
Type 2 diabetes is by far the most common form. Here the body still makes insulin, at least early on, but cells respond to it poorly, a problem called insulin resistance. Over time the pancreas cannot keep up, and blood sugar climbs. Type 2 develops gradually and is closely linked with excess weight, inactivity, and genetics. Understanding the difference between type 1 and type 2 diabetes helps explain why treatments differ.
Zwangerschapsdiabetes
Gestational diabetes develops during pregnancy in people who did not have diabetes before. Pregnancy hormones can raise insulin resistance, and blood sugar rises as a result. It usually resolves after birth, but it raises the future risk of type 2 diabetes for both parent and child, so follow-up testing matters.
Prediabetes
Prediabetes means blood sugar is higher than normal but not yet high enough for a diabetes diagnosis. It is a warning stage, not a life sentence: with lifestyle changes, many people with prediabetes prevent or delay type 2 diabetes. Because prediabetes rarely causes symptoms, routine blood tests are the main way to catch it.
What causes diabetes, and who is at risk?
The causes of diabetes depend on the type. Type 1 stems from an autoimmune process that researchers link to a mix of genetic and environmental triggers; it is not caused by diet or lifestyle. Type 2 and gestational diabetes are driven mainly by insulin resistance, which is shaped by genetics, body weight, and daily habits.
Several factors raise the risk of type 2 diabetes:
- A family history of diabetes in a parent or sibling
- Excess weight, especially around the abdomen
- Low physical activity levels
- Age 35 and older, though younger cases are rising
- High blood pressure or abnormal cholesterol
- A history of gestational diabetes or polycystic ovary syndrome
- Certain ancestries with higher documented risk, per the CDC
A common myth is that eating sugar directly causes diabetes. Sugar itself does not cause type 1, and while a diet high in sugary drinks and calories contributes to weight gain and type 2 risk, the underlying problem is how the body handles all carbohydrates, not sugar alone.
What are the symptoms and warning signs?
Symptoms of diabetes come from blood sugar staying too high. In type 1 they can appear quickly over days or weeks; in type 2 they build so slowly that many people feel nothing for years. Recognizing the early warning signs of diabetes can lead to earlier testing and treatment.
- Increased thirst and a dry mouth
- Frequent urination, including waking at night to urinate
- Unexplained weight loss, more typical of type 1
- Constant hunger and fatigue
- Wazig zicht
- Langzaam genezende wonden of frequente infecties
- Tingling or numbness in the hands or feet
Because these signs overlap with everyday tiredness, the clearest next step is to check your bloedglucosewaarden.
Wanneer moet je een arts raadplegen?
Book a medical visit if you notice ongoing thirst, frequent urination, unexplained weight loss, or persistent fatigue. Seek urgent care right away for warning signs of dangerously high blood sugar, such as vomiting, deep or rapid breathing, fruity-smelling breath, confusion, or severe drowsiness. These can signal diabetic ketoacidosis, a medical emergency that needs immediate treatment.
How is diabetes diagnosed?
Diabetes is diagnosed with blood tests that measure how much glucose is in your blood, not from symptoms alone. During a routine checkup, or after warning signs appear, your clinician may order bloedtesten bij diabetes. Most tests are simple blood draws. Some also require vasten voor een bloedtest. Fasting keeps the reading at your baseline rather than reflecting a recent meal.
The four standard tests are the A1C (also called HbA1c), which reflects average blood sugar over about three months; the fasting plasma glucose test, taken after at least eight hours without food; the oral glucose tolerance test, which checks blood sugar two hours after a sugary drink; and the random plasma glucose test, taken at any time when symptoms are present. Doctors usually confirm a diagnosis with a repeat test on another day.
The American Diabetes Association and the National Institute of Diabetes and Digestive and Kidney Diseases define diabetes and prediabetes using the cutoffs below.
| Test | Normaal | Prediabetes | Diabetes |
|---|---|---|---|
| A1C (HbA1c) | Onder 5,7% | 5.7% tot 6.4% | 6.5% of hoger |
| Fasting plasma glucose | Below 100 mg/dL | 100 to 125 mg/dL | 126 mg/dL or higher |
| Orale glucosetolerantietest (2 uur) | Below 140 mg/dL | 140 to 199 mg/dL | 200 mg/dL or higher |
| Willekeurige plasmaglucosewaarde | Not used alone | Not used alone | 200 mg/dL or higher with symptoms |
How to read diabetes-related lab results
Diagnosis is only the start. Living well with diabetes means watching several markers that show how blood sugar is trending and whether it is affecting other organs. The table below explains the most common ones in plain language. To interpret them together rather than in isolation, many people upload their reports to a tool that reads lab results in context.
| Marker | Wat het meet | Why it matters in diabetes |
|---|---|---|
| HbA1c | Gemiddelde bloedsuikerspiegel over een periode van ongeveer drie maanden | Confirms diagnosis and tracks long-term control |
| Fasting plasma glucose | Blood sugar after eight or more hours without food | A common first screening test |
| C-peptide | How much insulin the pancreas still makes | Helps tell type 1 from type 2 |
| Urine albumin-to-creatinine ratio | Tiny amounts of protein leaking into urine | An early sign of diabetic kidney damage |
| eGFR and creatinine | Hoe goed de nieren afvalstoffen filteren | Monitors kidney health over time |
| Lipidenpanel | Cholesterol en triglyceriden | Gauges heart-disease risk that often rises with diabetes |
If your pancreas function is in question, doctors sometimes order a C-peptide test. When kidneys need watching, your care team monitors a nierfunctiepanel. To weigh heart risk, many clinicians also order a volledig lipidenprofiel. Many checkups also include a uitgebreid metabolisch panel, which reports glucose alongside kidney and liver markers in one draw.
Treatments and daily management
Treatment aims to keep blood sugar within a healthy range, ease symptoms, and prevent complications. The plan depends on the type, but three pillars appear in most cases: lifestyle, medication, and, for some, insulin.
Lifestyle foundations
For type 2 diabetes and prediabetes, food choices and movement do much of the work. A balanced plate that limits refined carbohydrates and sugary drinks, regular physical activity, adequate sleep, and steady weight management all improve how the body uses insulin. Even modest, sustained weight loss can meaningfully lower blood sugar.
Medicijnen
When lifestyle alone is not enough, several medication classes help. Metformin is often the first oral medicine for type 2 diabetes. Newer options, discussed in the advances section below, both lower blood sugar and support weight loss. These medications are matched to your blood sugar pattern, other health conditions, and personal goals, so the right choice varies from person to person.
Insulin therapy
People with type 1 diabetes need insulin for life because their bodies no longer make it. Some people with type 2 also use insulin when other treatments cannot keep blood sugar in range. Insulin is delivered by injection or a pump, and doses are adjusted to food, activity, and glucose readings.
Complications and monitoring
The reason blood sugar control matters so much is that long-term high glucose damages blood vessels and nerves. Common complications include heart and blood-vessel disease, kidney disease, nerve damage known as neuropathy, and eye damage called retinopathy that can threaten vision. Foot problems and slow-healing wounds are also more likely.
Good news: careful monitoring greatly lowers these risks. Alongside home glucose checks, your care team examines the eyes and feet, watches kidney markers, and tracks your hemoglobin A1c results. Accurate readings often require fasting before a blood test, so follow your lab instructions. Catching changes early gives you and your care team time to adjust the plan before small problems become large ones.
Living with diabetes
A diagnosis is a starting point, not the end of a full life. Millions of people manage the condition for decades while working, traveling, and exercising. The keys are a consistent routine, an understanding of your own numbers, and a supportive care team. Learning to read your reports turns anxiety into action: when you know what a rising A1C or an out-of-range glucose means, you can respond calmly and early. Emotional health matters too, since stress and burnout can affect blood sugar and motivation.
Latest scientific advances in diabetes
Diabetes care has changed quickly in recent years. Here are five developments from 2023 to 2026, explained in plain language, with what each one may mean for you.
Weekly injections that lower blood sugar and weight
A class of medicines called GLP-1 receptor agonists (they copy a gut hormone that helps control blood sugar and appetite) can both lower blood sugar and help many people lose weight. According to PubMed, a large review of 76 trials found these medicines reliably reduce the long-term sugar marker, and a dual-action version called tirzepatide, which activates two hormone pathways at once, lowered it the most, as reported by Yao and colleagues (DOI) and confirmed in a head-to-head analysis by Karagiannis and colleagues (DOI). What this means for you: for many people with type 2 diabetes, a single once-weekly medicine can now address blood sugar and weight together, though whether it suits you is a conversation for your doctor.
Medicines that also protect the heart and kidneys
Some of these medicines do more than lower glucose. Based on articles retrieved from PubMed, a kidney-focused trial found that semaglutide reduced the risk of serious kidney and heart events in people with type 2 diabetes and chronic kidney disease, as reported by Mann and colleagues (DOI). What this means for you: treatment choices may now weigh organ protection, not only sugar numbers, especially if your kidneys are already under strain.
Continuous glucose monitors help in type 2, not just type 1
A continuous glucose monitor is a small wearable sensor that reads glucose day and night, so you see trends instead of single snapshots. According to PubMed, a review of trials in type 2 diabetes found these sensors modestly improved control and increased time in range, meaning the share of the day that glucose stays in a healthy window, as reported by Jancev and colleagues (DOI). What this means for you: a sensor can reveal patterns that a few finger-prick checks miss, helping you and your doctor fine-tune food, activity, and medication.
Substantial weight loss can push type 2 into remission
Remission means blood sugar returns to a non-diabetic range without glucose-lowering medicine. Based on articles retrieved from PubMed, a review found a strong dose-response link: the more weight people lost, the more likely their type 2 diabetes went into remission, as reported by Kanbour and colleagues (DOI). Related work explains that type 2 is closely tied to fat stored in the liver and pancreas, which weight loss can reverse, as described by Taylor (DOI). What this means for you: for some people, type 2 diabetes is not necessarily permanent, though remission is not guaranteed and can fade if weight returns, so any plan should be supervised by a clinician.
Delaying type 1 diabetes before it starts
For type 1 diabetes, prevention is now on the horizon. According to PubMed, an immune-system treatment called teplizumab can delay the onset of type 1 in people at high risk who are identified by autoantibody blood tests, which are early immune markers, and screening programs are expanding, as reviewed by Ziegler and colleagues (DOI). What this means for you: relatives of someone with type 1 may benefit from early screening, since finding risk sooner opens the door to newer, disease-modifying options.
Glossarium
| Termijn | Definitie |
|---|---|
| Insuline | A hormone from the pancreas that lets glucose move from the blood into cells for energy. |
| Insulineresistentie | A state in which cells respond poorly to insulin, a core feature of type 2 diabetes. |
| HbA1c (A1C) | A blood test that reflects average blood sugar over roughly three months. |
| Fasting plasma glucose | Blood sugar measured after at least eight hours without food. |
| Oral glucose tolerance test | A test that checks blood sugar two hours after a measured sugary drink. |
| Prediabetes | Blood sugar that is higher than normal but not yet in the diabetes range. |
| C-peptide | A substance released with insulin that shows how much insulin the body makes. |
| Continuous glucose monitor | A wearable sensor that measures glucose continuously through the day and night. |
| Diabetische ketoacidose | A dangerous complication of very high blood sugar that needs emergency care. |
Veelgestelde vragen
What are the early warning signs of diabetes?
The most common early signs are increased thirst, frequent urination, fatigue, blurred vision, and slow-healing cuts. In type 1 they can appear within days or weeks, while in type 2 they often build so gradually that people miss them. Because symptoms are easy to overlook, a blood test is the most reliable way to know. If these signs sound familiar, ask your clinician about screening.
What is a normal blood sugar level?
For most adults without diabetes, a fasting blood sugar below 100 mg/dL is considered normal, and an A1C below 5.7% is in the normal range. Readings between those normal values and the diabetes cutoffs fall into the prediabetes range. Targets can differ for people who already have diabetes, so discuss your personal goals with your care team rather than comparing yourself to a single number.
What is the difference between type 1 and type 2 diabetes?
In type 1 diabetes, the immune system destroys insulin-making cells, so the body makes little or no insulin and needs it daily. In type 2 diabetes, the body still makes insulin but uses it poorly, and it is strongly linked to weight, activity, and genetics. Type 1 usually starts younger and quickly, while type 2 develops slowly, often in adulthood. A C-peptide test can help doctors tell them apart.
Can type 2 diabetes be reversed or cured?
There is no permanent cure, but type 2 diabetes can go into remission, meaning blood sugar returns to a non-diabetic range without glucose-lowering medicine. Substantial, sustained weight loss makes remission more likely, and the more weight lost, the greater the chance. Remission is not guaranteed and can fade if weight returns, so any approach should be planned and monitored with a clinician.
Veroorzaakt het eten van te veel suiker diabetes?
Sugar alone does not directly cause diabetes. Type 1 is an autoimmune condition unrelated to diet. For type 2, a diet high in sugary drinks and excess calories contributes to weight gain and higher risk, but the deeper issue is how the body handles all carbohydrates and insulin. A balanced diet and regular activity lower risk more than simply avoiding sugar.
Which blood tests are used to diagnose diabetes?
Doctors mainly use four tests: the A1C, the fasting plasma glucose test, the oral glucose tolerance test, and the random plasma glucose test taken when symptoms are present. A diagnosis is usually confirmed with a repeat test on a second day. Your clinician chooses the test based on your situation, and some require fasting beforehand for an accurate result.
Bronnen
- Centers for Disease Control and Prevention — Diabetes Basics — cdc.gov
- National Institute of Diabetes and Digestive and Kidney Diseases (NIH) — Diabetes Tests and Diagnosis — niddk.nih.gov
- American Diabetes Association — Diagnosis — diabetes.org
- Yao H, et al. — Comparative effectiveness of GLP-1 receptor agonists on glycaemic control, body weight, and lipid profile for type 2 diabetes: systematic review and network meta-analysis — BMJ, 2024 — doi.org/10.1136/bmj-2023-076410
- Karagiannis T, et al. — Subcutaneously administered tirzepatide vs semaglutide for adults with type 2 diabetes: a systematic review and network meta-analysis — Diabetologia, 2024 — doi.org/10.1007/s00125-024-06144-1
- Jancev M, et al. — Continuous glucose monitoring in adults with type 2 diabetes: a systematic review and meta-analysis — Diabetologia, 2024 — doi.org/10.1007/s00125-024-06107-6
- Mann JFE, et al. — Effects of semaglutide with and without SGLT2 inhibitor use in type 2 diabetes and chronic kidney disease (FLOW trial) — Nature Medicine, 2024 — doi.org/10.1038/s41591-024-03133-0
- Kanbour S, et al. — Impact of bodyweight loss on type 2 diabetes remission: a systematic review and meta-regression analysis — The Lancet Diabetes and Endocrinology, 2025 — doi.org/10.1016/S2213-8587(24)00346-2
- Taylor R — Understanding the cause of type 2 diabetes — The Lancet Diabetes and Endocrinology, 2024 — doi.org/10.1016/S2213-8587(24)00157-8
- Ziegler AG, et al. — The future of type 1 diabetes therapy — The Lancet, 2025 — doi.org/10.1016/S0140-6736(25)01438-2
Verder lezen
- Fructosamine: Wat het meet en hoe u uw waarden kunt aflezen
- Urinecreatininegehalte: Richtlijnen en interpretatie
- De cholesterolratio uitgelegd: betekenis en risico's
- Inzicht in normale triglycerideniveaus en -waarden
- PCOS: Symptoms, Causes, Diagnosis, and Tests
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Diabetes is easier to manage when you understand the numbers behind it. AI DiagMe helps you make sense of results like HbA1c, fasting glucose, and a full lipid panel by reading them in context and explaining what they mean in plain language. It is designed to help you understand your reports and prepare better questions for your appointment. It does not diagnose and does not replace your doctor.
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