Insulin Resistance and Prediabetes: Symptoms, Diagnosis and Treatment in Spain
Medically Reviewed by Dr. Pedro Yelamo Vera, MD
Licensed Physician No. 484814280 · Official Medical College of Bizkaia (Spain)
Evidence-based assessment and follow-up of insulin resistance and prediabetes with a licensed, English-speaking GP.
Dr. Pedro Yelamo Vera
Licence No. 484814280 · Urgent, non-emergency care
Common Symptoms
Insulin resistance means your cells respond less well to insulin, so the pancreas produces more of it to keep blood sugar normal. Over years this can progress to prediabetes and type 2 diabetes, and it drives weight gain around the waist, fatty liver and heart risk. It often causes no symptoms at all; when it does, you may notice:
- Weight that collects around the waist and is hard to shift despite dieting
- Tiredness or sleepiness after meals, and cravings for sweet or starchy food
- Dark, velvety patches of skin on the neck, armpits or groin (acanthosis nigricans) or skin tags
- Irregular periods, acne or excess hair in women (polycystic ovary syndrome)
- High triglycerides, low HDL cholesterol, raised blood pressure or a fatty liver on tests
- Increased thirst and passing more urine once blood sugar starts to rise
- A family history of type 2 diabetes, or gestational diabetes in a past pregnancy
Being told your sugar is 'a bit high' or that you are prediabetic is unsettling, and the internet is full of supplements and crash diets. The reassuring evidence is that prediabetes is reversible in most people: in the Diabetes Prevention Program, a modest weight loss and regular activity cut progression to diabetes by 58%, more than any tablet.
You don't have to figure this out alone
Dr. Pedro Yelamo Vera is an independent, bilingual GP licensed in Spain. Book a 20-minute video consultation in English or Spanish for €50, with a private electronic prescription issued under Spanish law when clinically appropriate.
How We Treat It
The doctor will review your weight history, waist, blood pressure, family history, sleep, activity and any previous blood tests, and will order the tests that actually define the condition. Care usually includes:
- Blood tests: HbA1c and fasting glucose to diagnose prediabetes, plus lipids, liver enzymes and, where relevant, thyroid, vitamin D and a fasting insulin or HOMA-IR estimate
- A realistic nutrition plan based on Mediterranean-style eating, which has the strongest evidence in Spain, with attention to portion size, refined carbohydrate and alcohol
- An activity plan of at least 150 minutes a week of brisk walking or equivalent, plus resistance exercise, which improves insulin sensitivity even before weight changes
- Sleep and stress review, including screening for sleep apnoea, which worsens insulin resistance
- Medication when lifestyle alone is not enough and criteria are met: metformin for selected higher-risk patients, and assessment for weight-loss treatment where obesity criteria apply
- Follow-up with repeat HbA1c every 6 to 12 months and a plan for blood pressure, cholesterol and liver health
There is no single blood test that 'proves' insulin resistance; the diagnosis rests on the clinical picture and glucose results, and HOMA-IR is an estimate, not a target. Supplements such as berberine, chromium or cinnamon are not a substitute for the measures above. Any prescription, including for weight-loss medication, is considered only after a full assessment and when clinically indicated.
Clinical Evaluation & Evidence-Based Protocol for Insulin Resistance and Prediabetes: Symptoms, Diagnosis and Treatment
During a telemedicine consultation with Dr. Pedro Yelamo Vera (licensed medical practitioner No. 484814280 at the Official Medical College of Bizkaia), clinical evaluation adheres strictly to evidence-based medical (EBM) standards. The doctor conducts a thorough history, evaluating symptom duration, aggravating factors, prior treatments, and drug allergies to establish an accurate differential diagnosis.
Private Electronic Prescriptions (Receta Médica) Issued Under Spanish Law
When clinically indicated, Dr. Yelamo issues a private electronic prescription (Receta Médica Electrónica Privada) under Spanish law. The digital prescription contains a secure QR verification code accepted at all 22,000+ registered community pharmacies across Spain for immediate medication dispensing.
Itemized Invoices for Travel & Private Health Insurance Reimbursement
After your consultation, you receive an official medical report and an itemized invoice. The invoice shows Dr. Yelamo's licence details and tax ID. You can send it to your travel or private health insurer (such as Bupa, Allianz, Cigna, AXA or a US travel policy) to claim the cost back.
Preparing for Your Online Medical Consultation
Before your appointment, note when your symptoms started and any medicines you have already tried. Have your allergies and your usual prescriptions to hand. For a skin, rash or eye problem, sit in a well-lit room so the doctor can see it clearly.
Clinical Follow-Up & When In-Person Urgencias Are Necessary
Video care works well for common infections, mild sudden symptoms, skin rashes and repeat prescriptions. Some warning signs need emergency care in person: severe shortness of breath, a high fever you cannot bring down, chest pain or a stiff neck. If you have any of them, call 112 in Spain straight away.
When to Seek Immediate In-Person Care
Seek urgent in-person care if you have:
- Extreme thirst, passing large volumes of urine, vomiting, abdominal pain or drowsiness (possible very high blood sugar)
- A home glucose reading above 300 mg/dL (16.7 mmol/L) with symptoms, or above 400 mg/dL at any time
- Rapid, unexplained weight loss with high sugar readings
- Chest pain, breathlessness or weakness on one side of the body
- A foot wound that is not healing, especially with numbness
- Sudden blurred vision or loss of vision
Frequently asked questions
What is the difference between insulin resistance and prediabetes?
Insulin resistance is the underlying process: the muscles, liver and fat tissue respond less to insulin, so more is needed. Prediabetes is a laboratory diagnosis that appears when that process starts to push blood sugar above normal but not yet into the diabetes range: an HbA1c of 5.7 to 6.4% (39 to 46 mmol/mol) or a fasting glucose of 100 to 125 mg/dL. Many people with insulin resistance still have normal sugar levels because their pancreas is compensating.
Which tests diagnose it?
HbA1c and fasting glucose are the standard tests and can be done at any laboratory in Spain with a request from the doctor. A fasting insulin level allows a HOMA-IR calculation, which is useful as a marker but has no agreed cut-off, so it is interpreted together with waist size, triglycerides, HDL, blood pressure and liver tests. An oral glucose tolerance test is used in specific situations, such as after gestational diabetes.
Can insulin resistance and prediabetes be reversed?
Often, yes. Losing 5 to 7% of body weight, walking briskly for 150 minutes a week, adding resistance exercise, cutting refined carbohydrate and sugary drinks, improving sleep and stopping smoking all improve insulin sensitivity within weeks and can return HbA1c to normal. The effect is largest when started early, which is why a prediabetes result is an opportunity rather than a sentence.
Do I need medication?
Most people do not at first. Guidelines suggest considering metformin for those at higher risk of progressing, for example with a BMI of 35 or more, age under 60 or previous gestational diabetes, when lifestyle changes have not been enough. Weight-loss medication is considered only where obesity criteria are met and after a full assessment, and never as a shortcut. Any decision is made with you after reviewing your results.
Is insulin resistance linked to PCOS and fatty liver?
Yes. Insulin resistance is a central feature of polycystic ovary syndrome and of metabolic dysfunction-associated fatty liver disease, and all three share the same treatment foundation: weight management, exercise and a Mediterranean-style diet. If you have irregular periods, acne or excess hair, or raised liver enzymes, the doctor will include those in the assessment and arrange the right scan or referral.
How does follow-up work with an online doctor in Spain?
After the first video consultation you receive a written plan and a laboratory request you can use at a private laboratory near you. Results are reviewed in a follow-up call, where targets and any medication are agreed. HbA1c is repeated every 6 to 12 months, and blood pressure, cholesterol and weight are tracked in the same reviews, so one structured plan covers the whole metabolic picture.
Online consultations are for urgent, non-emergency care. In a medical emergency call 112 immediately or go to your nearest emergency department.
Tue · Thu · Fri · SatOne named doctor, from first call to follow-up
Book a secure 20-minute video consultation with Dr. Pedro Yelamo Vera for €50. Same-day slots are often available. For urgent, non-emergency care; in an emergency, call 112.
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