PCOS and Insulin Resistance: Understanding the Connection
PCOS Is More Than a Reproductive Condition
Polycystic ovary syndrome, commonly called PCOS, is a complex hormonal and metabolic condition. It can affect menstrual cycles, ovulation, fertility, skin, hair growth, weight, blood sugar, cardiovascular health and emotional well-being.
PCOS is common, but many people remain undiagnosed. The World Health Organization estimates that it affects approximately 10%–13% of reproductive-age women and that up to 70% of affected women worldwide may not know they have it. (World Health Organization)
Although the name focuses on the ovaries, PCOS is not simply a condition involving ovarian cysts. A person can have PCOS without having ovarian cysts, and ovarian cysts alone do not establish a PCOS diagnosis.
For many patients, insulin resistance is a central part of the condition. At Metabolic Centers for Excellence, we look beyond reproductive symptoms to evaluate how blood sugar, insulin resistance, nutrition, weight and other metabolic factors may be affecting the patient’s overall health.
What Is PCOS?
PCOS develops when reproductive hormones, metabolic signals and ovarian function become disrupted.
Common features of PCOS include:
- Irregular or absent ovulation
- Irregular or missed menstrual periods
- Elevated androgen activity
- Excess facial or body hair
- Acne or oily skin
- Thinning scalp hair
- Difficulty becoming pregnant
- Polycystic-appearing ovaries on ultrasound
- Insulin resistance
- Difficulty managing weight
Not every patient experiences the same symptoms, and a person does not need to have every feature to receive a diagnosis.
PCOS is generally diagnosed after a healthcare provider evaluates menstrual patterns, symptoms, physical findings and laboratory results. Ultrasound may be used when clinically appropriate, but it is not required in every case. Other conditions that can cause similar symptoms must also be considered. (OUP Academic)
Frequently Asked Questions
Insulin is a hormone produced by the pancreas. It helps move glucose from the bloodstream into the body’s cells, where glucose can be used for energy.
With insulin resistance, the cells do not respond to insulin as effectively as they should. The pancreas attempts to compensate by producing more insulin.
This means that a patient may have elevated insulin levels even when fasting glucose or A1C has not yet entered the prediabetes range.
Insulin resistance is present in many patients with PCOS and increases the risk of prediabetes and type 2 diabetes. It can occur in patients of any body size, including those who are not overweight. (NIDDK)
How Elevated Insulin May Affect PCOS
Elevated insulin levels may stimulate the ovaries to produce more androgens. Androgens are hormones present in everyone, but excessive androgen activity can interfere with normal ovulation and contribute to common PCOS symptoms.
This may lead to:
- Irregular or absent periods
- Reduced or unpredictable ovulation
- Difficulty becoming pregnant
- Excess facial or body hair
- Acne
- Thinning scalp hair
- Increased abdominal weight
- Greater difficulty losing weight
PCOS can create a difficult cycle:
Insulin resistance may raise insulin levels → elevated insulin may increase androgen activity → increased androgen activity and abdominal fat may further worsen insulin resistance.
Addressing the metabolic portion of PCOS can therefore be an important part of a comprehensive treatment plan.
Yes.
PCOS and insulin resistance can affect patients who are:
- Underweight
- At an average weight
- Overweight
- Living with obesity
Weight can influence symptoms and long-term risk, but body size does not determine whether someone has PCOS.
A patient who appears lean may still have:
- Insulin resistance
- Elevated insulin
- Abnormal glucose tolerance
- High androgen levels
- Irregular ovulation
- Abnormal cholesterol
- Increased risk of type 2 diabetes
This is why metabolic screening may be appropriate regardless of a patient’s weight.
How Is PCOS Diagnosed?
There is no single test that diagnoses every case of PCOS.
A comprehensive evaluation may include:
- Menstrual and reproductive history
- Pregnancy history
- Family history
- Physical examination
- Review of acne and hair-growth changes
- Blood-pressure evaluation
- Weight and waist measurement
- Laboratory testing
- Pelvic ultrasound when appropriate
Laboratory Testing May Include
Depending on the patient’s symptoms and history, testing may include:
- Total and free testosterone
- Other androgen markers
- Pregnancy testing
- Thyroid testing
- Prolactin
- A1C
- Fasting glucose
- Oral glucose-tolerance testing
- Cholesterol and triglycerides
- Liver and kidney function
- Additional hormone testing
A healthcare provider must also consider other possible causes of irregular periods or elevated androgen activity.
Current evidence-based guidance recommends evaluating PCOS as a condition that can affect reproductive, metabolic, cardiovascular, sleep and emotional health—not simply ovarian appearance. (OUP Academic)
Health Risks Associated With PCOS
PCOS can affect health well beyond menstrual cycles and fertility.
Prediabetes and Type 2 Diabetes
Insulin resistance may gradually progress to prediabetes or type 2 diabetes. The CDC identifies PCOS as an important risk factor for type 2 diabetes and recommends attention to glucose-related risk. (CDC)
Metabolic Syndrome
Patients with PCOS may develop several interconnected metabolic risk factors, including:
- Elevated blood sugar
- High blood pressure
- High triglycerides
- Low HDL cholesterol
- Increased abdominal weight
When several of these conditions occur together, they are known as metabolic syndrome.
Cardiovascular Risk
PCOS may occur alongside high blood pressure, abnormal cholesterol, insulin resistance, inflammation and impaired glucose regulation.
Because these factors can increase long-term cardiovascular risk, patients should receive appropriate blood-pressure, cholesterol and glucose screening. The international PCOS guideline recommends awareness and assessment of cardiovascular risk factors. (OUP Academic)
Fatty Liver Disease
Insulin resistance, elevated triglycerides and increased abdominal fat may raise the risk of metabolic dysfunction-associated steatotic liver disease, formerly called nonalcoholic fatty liver disease.
Endometrial Problems
When ovulation occurs infrequently, the uterine lining may not shed regularly.
Prolonged missed periods can increase the risk of abnormal thickening of the uterine lining. Patients with extended periods of absent menstruation, unusually heavy bleeding or abnormal bleeding should receive appropriate gynecologic evaluation.
Pregnancy Concerns
PCOS may increase the risk of:
- Difficulty becoming pregnant
- Gestational diabetes
- Pregnancy-related high blood pressure
- Other pregnancy complications
Patients who are pregnant or planning pregnancy should work closely with an obstetric, gynecology or fertility provider.
There is no single treatment that is right for every patient.
Treatment depends on:
- The patient’s symptoms
- Menstrual pattern
- Metabolic health
- Fertility goals
- Glucose levels
- Cardiovascular risk
- Weight-management needs
- Age and medical history
- Personal preferences
PCOS treatment may involve primary care, gynecology, endocrinology, fertility care, dermatology, nutrition and metabolic-health services.
Symptoms of PCOS
PCOS symptoms can begin during adolescence or become more noticeable during adulthood. Some patients are diagnosed after experiencing menstrual changes, while others do not discover the condition until they seek help with fertility or metabolic concerns.
Menstrual and Ovulation Symptoms*
- Irregular, unpredictable, or missed periods
- Long menstrual cycles
- Heavy or prolonged bleeding
- Very light periods
- Infrequent or absent ovulation
- Difficulty determining when ovulation occurs
Signs of Elevated Androgen Activity
- Excess facial hair
- Hair growth on the chest/abdomen/back/thighs
- Persistent acne
- Oily skin
- Thinning scalp hair
- Male-pattern hair loss
Metabolic
Symptoms
- Difficulty losing weight/unexplained weight gain
- Increased weight around the abdomen
- Frequent hunger and sugar/carb cravings
- Fatigue after meals/fluctuating energy/brain fog
- Elevated blood sugar or prediabetes
- High triglycerides or low HDL cholesterol
- High blood pressure
Skin Changes**
- Darkened or thickened skin around the neck
- Darkened skin beneath the arms or breasts
- Darkened skin in the groin
- Skin tags
- Acne
- Oily skin
Fertility Symptoms***
- Difficulty becoming pregnant
- Irregular or absent ovulation
- Unpredictable fertile windows
- The need for ovulation-inducing treatment
Sleep and Emotional Health****
- Poor sleep
- Snoring or obstructive sleep apnea
- Anxiety/Depression
- Eating-related concerns
- Reduced self-esteem or body-image challenges
- Reduced quality of life
*These symptoms can have many causes and do not establish a PCOS diagnosis on their own.
*Irregular ovulation, excess hair growth and acne are among the most recognized PCOS symptoms. (World Health Organization)
**Dark, thickened or velvety skin is called acanthosis nigricans and may be a visible sign of insulin resistance.
***PCOS is a leading cause of infertility related to irregular ovulation, but many patients with PCOS can become pregnant naturally or with appropriate treatment. (World Health Organization)
****Current international guidance recommends that PCOS care address emotional health, sleep and quality of life in addition to reproductive and metabolic concerns. (OUP Academic)
PCOS Treatment Options
Treatments for Acne and Excess Hair Growth
Treatment options may include:
Medications for Insulin Resistance
Metformin may help:
Medical Weight-Management Treatment
Options may include:
Nutrition and Lifestyle Treatment
An individualized plan may focus on:
Treatments for Irregular Periods
For patients who are not trying to become pregnant, treatment may include:
Fertility Treatment
For patients trying to become pregnant, treatment may include:
Why Some Patients Need More Than Hormone Management
Many patients are prescribed birth control to regulate menstrual bleeding or metformin to address metabolic risk. These can be appropriate treatments, but patients may continue to struggle with:
Fatigue
Difficulty losing weight
Food cravings
Elevated insulin
Prediabetes
Abnormal cholesterol
High blood pressure
Poor sleep
Difficulty maintaining lifestyle
Symptoms treated in isolation
At Metabolic Centers for Excellence, we look at how the patient’s hormonal, reproductive and metabolic concerns may be connected.
How MCE Can Help
Metabolic Centers for Excellence provides an individualized metabolic approach for patients with PCOS, insulin resistance, prediabetes, metabolic syndrome and related health concerns. MCE does not replace a patient’s gynecologist, endocrinologist or fertility specialist. Our services are intended to complement appropriate reproductive and specialty care by evaluating and treating the metabolic factors that may be contributing to PCOS symptoms and long-term health risks.
Comprehensive Metabolic Evaluation
Hormonal or reproductive testing may be reviewed or coordinated with the patient’s provider.
Individualized Nutrition Support
The plan is individualized rather than based on a restrictive, one-size-fits-all PCOS diet.
Medical Weight-Management Support
When appropriate, the treatment plan may include additional support
Targeted Supplement Support
Recommendations should be based on the patient’s medications, laboratory findings, pregnancy plans, diagnoses and provider evaluation.
MCE's
MIT Program for Eligible Patients
MCE offers a medically supervised Metabolic Infusion Treatment, or MIT, for appropriately selected patients with qualifying glucose-related or metabolic conditions. MIT uses carefully controlled small doses of insulin with glucose monitoring and medical supervision as part of a broader metabolic-care program.
For a patient who has PCOS together with significant insulin resistance, prediabetes, type 2 diabetes or another qualifying metabolic condition, the MCE team may evaluate whether MIT or another metabolic treatment strategy is clinically appropriate.
When clinically appropriate, MIT may be included in a broader program involving:
- Metabolic testing
- Provider evaluation
- Blood-glucose monitoring
- Nutrition guidance
- Physical-activity recommendations
- Medication review
- Weight-management support
- Follow-up laboratory testing
- Coordination with the patient’s healthcare team
MIT is not an established first-line treatment for PCOS itself. It should not be presented as: a cure for PCOS, a fertility treatment, a replacement for hormone management, a substitute for metformin or other prescribed medication, a replacement for gynecology or endocrinology care
Eligibility depends on the patient’s diagnosis, glucose levels, medications, insulin use, medical history and overall clinical risk.
Measuring Meaningful Progress
PCOS improvement should not be measured by weight alone. Depending on the treatment plan, MCE and the patient’s other healthcare providers may monitor:
Menstrual-cycle patterns
Ovulation patterns
A1C
Fasting glucose
Glucose readings
Cholesterol and triglycerides
Blood pressure
Waist measurement
Weight and body composition
Energy levels
Food cravings
Acne or hair-growth changes
Sleep quality
Medication requirements
Quality of life
Hormonal, menstrual and fertility outcomes should be monitored with the appropriate reproductive-health provider.
You Do Not Have to Wait for PCOS to Progress
PCOS is a long-term condition, but its symptoms and related health risks can often be managed through individualized medical care, metabolic treatment, healthy lifestyle changes and appropriate monitoring.
You do not have to wait until insulin resistance progresses to prediabetes or type 2 diabetes before taking action.
Medical Disclaimer
This webpage is intended for general educational purposes only and does not replace individualized medical advice, diagnosis, fertility treatment or treatment from a qualified healthcare provider.
PCOS requires individualized evaluation and may involve gynecology, endocrinology, primary care, fertility, dermatology, nutrition and metabolic-health professionals.
Patients should not begin, stop or change birth control, progesterone, metformin, insulin, fertility medication, weight-management medication, supplements or other prescribed treatment without direction from the prescribing provider.
MIT is a medically supervised treatment offered only to appropriately selected patients following a clinical evaluation. It is not an established first-line treatment or cure for PCOS and does not replace standard gynecologic, endocrine, fertility or metabolic care. Individual responses and outcomes vary.