PCOS, weight and insulin resistance: what helps and what to ask
Medically Reviewed by Dr. Pedro Yelamo Vera, MD
Licensed Physician No. 484814280 · Official Medical College of Bizkaia (Spain)Last reviewed: 12 October 2026
PCOS weight and insulin resistance explained: how PCOS is diagnosed, what the 2023 guideline says helps, and the questions to ask your doctor in Spain.
You don't have to figure this out alone
Dr. Pedro Yelamo Vera is an independent, bilingual GP licensed in Spain. Book a 15-minute video consultation in English or Spanish for €50, with a private electronic prescription issued under Spanish law when clinically appropriate.
PCOS weight worries are common, and they are not your fault. Polycystic ovary syndrome (PCOS) affects hormones, periods, skin, mood and how the body handles sugar. Many people with PCOS find weight harder to manage. This guide explains what the evidence says, what tends to help, and what to ask a doctor. It is for expats, residents and travellers in Spain.
- PCOS is found by checking periods, signs of high male-type hormones, and the ovaries, once other causes are ruled out.
- PCOS is linked with insulin resistance and a higher risk of type 2 diabetes, at any weight.
- Healthy habits come first, with no blame and no weight stigma.
- Medicines can help with periods, skin, sugar control or weight. The choice depends on your goals, including pregnancy plans.
- Ask about mood, sleep and fertility too. They are part of PCOS care.
What PCOS is, and its new name
PCOS is one of the most common hormone conditions in women of child-bearing age. The main guide doctors use is the 2023 International Evidence-based Guideline. It was led by Monash University with ESHRE and other expert groups.
In May 2026, a global group agreed a new name: polyendocrine metabolic ovarian syndrome (PMOS). The new name stresses that this is a whole-body condition, not just "cysts" on the ovaries. Most clinics, lab forms and records in Spain will still say PCOS or SOP for a while. Both names mean the same condition.
How PCOS is diagnosed
In adults, the guideline uses the Rotterdam approach. You need two of these three features, once other causes are ruled out:
- Irregular or absent periods, which point to irregular ovulation.
- Signs of high androgens (male-type hormones). This can show as excess hair, acne or scalp hair loss, or as high levels on a blood test.
- Polycystic ovaries on an ultrasound scan, or a high AMH blood test in adults.
If you have both irregular periods and signs of high androgens, you do not need a scan. In teenagers, the rules are stricter. Both irregular periods and high androgens are needed, and scans are not used in the first years after periods start.
Your doctor will also check for other causes. These include thyroid problems, high prolactin and some rare adrenal conditions.
PCOS, insulin resistance and type 2 diabetes
Insulin is the hormone that moves sugar from the blood into cells. With insulin resistance, the body needs more insulin to do the same job. High insulin can push the ovaries to make more androgens. That can make periods and skin symptoms worse.
People with PCOS have a higher risk of prediabetes, type 2 diabetes and diabetes in pregnancy. This is true at a lower weight too, though extra weight adds to the risk. So the guideline says to check blood sugar at diagnosis, and then every one to three years based on your risk.
The most accurate test is an oral glucose tolerance test. If that is not possible, a fasting glucose or HbA1c test can be used. Routine "insulin level" tests are not advised, as they are not reliable for decisions. Our guide on HbA1c and prediabetes results explains what the numbers mean.
Lifestyle comes first, without weight stigma
The guideline puts healthy habits at the centre of care, all through life. It also says doctors should avoid weight stigma. A good doctor will ask before weighing you and explain why it matters.
There is no single best diet or exercise plan for PCOS. The right plan is one you can keep up. Small, steady changes in sleep, movement, food and stress can improve sugar control and cycles. They help even if the scale barely moves.
If you have had an eating disorder, or you notice strict food rules taking over, tell your doctor. The guideline asks doctors to think about disordered eating at any weight. Weight care should never mean harsh limits or skipping meals.
Medicines discussed in the guideline
Medicine choice depends on what matters most to you. That could be regular periods, skin, sugar control, weight or getting pregnant. Below is a general overview, not a plan for you.
| Option | Main use in PCOS | Points to raise |
|---|---|---|
| Combined pill | First choice for irregular periods, excess hair and acne if you do not want to get pregnant | Blood clot risk, smoking, migraine and blood pressure need checking |
| Metformin | Mainly for metabolic features, such as insulin resistance or high blood sugar | Stomach upset is common at the start. It is not used as routine care in pregnancy |
| Anti-obesity medicines, including GLP-1 medicines | May be considered under general obesity rules | Not used in pregnancy. Reliable birth control is needed. Stop well before trying to conceive |
| Fertility medicines | Help ovulation when trying to conceive | Prescribed and checked by a gynaecology or fertility team |
GLP-1 medicines and pregnancy plans
GLP-1 medicines include semaglutide (Wegovy). A related medicine is tirzepatide (Mounjaro). Both are prescription-only. The EU product information says they must not be used in pregnancy. Women who could get pregnant should use birth control while on them.
These medicines stay in the body for weeks. So the product information says to stop them at least one to two months before a planned pregnancy, depending on the medicine. If you get pregnant while taking one, stop it and contact your doctor. The advice on breastfeeding differs between these medicines, so ask first. Learn more in our guide on how GLP-1 weight-loss medicines work.
Under-18s with PCOS and weight concerns need care led by a specialist team.
Fertility and gynaecology
PCOS is a common cause of trouble getting pregnant, but many people with PCOS do conceive. The guideline names letrozole as the first medicine to help ovulation. A gynaecology or fertility team should guide this.
Ask for a gynaecology referral if you are trying for a baby, or if your periods are very far apart. Long gaps between periods can thicken the womb lining. Your doctor may suggest ways to protect it. PCOS also raises some risks in pregnancy, such as diabetes and high blood pressure. Plan ahead with your doctor.
Mood, body image and sleep
Anxiety and low mood are much more common with PCOS. The guideline says doctors should screen for depression and anxiety. Tell your doctor how you feel, not just how you look. Help is there.
Sleep apnoea is also more common. Signs include loud snoring, waking up unrefreshed and feeling sleepy in the day. If you have these, ask about a sleep check. A sleep study is needed to confirm it.
When to get help quickly
Some symptoms need prompt care and are not a reason to wait for a planned visit:
- Severe pain in the lower tummy, or pain with fainting. This may be an ovarian problem or a pregnancy outside the womb.
- Severe tummy pain that spreads to the back, with or without vomiting, if you take a GLP-1 medicine. This can be a sign of pancreatitis or a gallbladder problem.
- Vomiting that will not stop, or signs of dehydration.
- Shakiness, sweating or confusion if you take insulin or a sulfonylurea. This may be low blood sugar.
- Swelling of the face or throat, or trouble breathing.
- A positive pregnancy test while on a weight-loss medicine.
For a medical emergency, call 112 or go to the nearest local emergency department. Do not wait for a video consultation or an online reply.
Questions to ask your doctor
- Do my symptoms and tests fit PCOS, or could it be something else?
- Which blood sugar test should I have, and how often?
- What matters most for me right now: periods, skin, weight, mood or pregnancy?
- Which medicine fits my goals, and what are the risks?
- Do I need to see a gynaecologist, a fertility team or a sleep clinic?
- How should I plan if I want to get pregnant in the next year?
How a video visit can help
Dr. Pedro Yelamo Vera is a GP licensed in Spain (Colegiado No. 484814280). He also holds a Postgraduate Certificate in Clinical Nutrition. He sees patients by video, in English or Spanish, while they are in Spain. In a Weight Optimization consultation, he can review your history, past results, medicines and goals. He can then help you plan tests, lifestyle steps and referrals.
Medicine is one possible part of that plan. Where clinically appropriate, following a genuine evaluation. Treatment and prescriptions are issued solely at the doctor's discretion based on evidence-based clinical guidelines. Any medicine is given as a private electronic prescription under Spanish law. A video visit cannot replace a pelvic exam or scan when you need one.
Talk through PCOS, weight and blood sugar with a GP
A 30-minute video visit in English or Spanish, for patients in Spain.
Frequently asked questions
Do I have to lose weight to treat PCOS?
No. Healthy habits can improve symptoms and sugar control even with little weight change. Care should focus on health goals, not blame.
Can I have PCOS if I am slim?
Yes. PCOS occurs at all weights. Insulin resistance and diabetes risk can also be raised in slim people with PCOS.
Is PCOS now called PMOS?
A global group agreed the new name polyendocrine metabolic ovarian syndrome in May 2026. Many records and clinics will still use PCOS for some time. Both terms describe the same condition.
Do I need an insulin blood test?
Usually not. The guideline does not advise routine insulin tests. A glucose tolerance test, fasting glucose or HbA1c is used to check blood sugar.
Can I take a GLP-1 medicine if I want to get pregnant?
These medicines are not used in pregnancy. The product information says to stop them at least one to two months before a planned pregnancy, depending on the medicine. Plan this with your doctor.
Will a video visit lead to a prescription?
Not always. Where clinically appropriate, following a genuine evaluation. Treatment and prescriptions are issued solely at the doctor's discretion based on evidence-based clinical guidelines.
Sources
- Monash University: International evidence-based guideline for PCOS (now PMOS)
- ESHRE: Polycystic ovary syndrome guideline
- Teede HJ et al. Recommendations from the 2023 international evidence-based guideline for PCOS. Eur J Endocrinol 2023 (PubMed 37580861)
- EMA: Wegovy product information (section 4.6)
- EMA: Mounjaro product information (section 4.6)
- AJMC: PCOS renamed PMOS (May 2026)
Related guides
Medical Citations & Sources
This content is written and reviewed by a licensed physician with reference to the following official health authorities.
