Is Coffee Bad for PCOS?

header pics coffee

You’re probably tired of reading online about the foods and drinks you supposedly should not consume if you have PCOS. And coffee is on the “forbidden” list from many “PCOS experts”. Yikes! And I know that many of you love coffee. I recently did a survey on the one food or beverage that you couldn’t give up. Out of 90 women, 30% of you said coffee!  So what’s the deal? As a registered dietitian, I like to back my recommendations up with science. So read on to get the lowdown. Is coffee bad for PCOS or can it fit into a PCOS friendly eating plan?

What’s in coffee?

Coffee naturally contains a variety of compounds including caffeine, diterpenes, antioxidants, and some essential nutrients. 

  • Caffeine, the most commonly consumed psychoactive drug, is a natural stimulant found in many teas, soft drinks, chocolates, and coffee. Caffeine works by increasing your brain activity and alertness while reducing tiredness. 
  • Diterpenes are oily substances which may contribute to increasing cholesterol levels. But don’t worry too much, as most of these oily substances get trapped by coffee filters. 
  • Antioxidants and essential vitamins/minerals include chlorogenic acid, melanoidins, vitamins B2 (riboflavin), B5 (pantothenic acid), B1 (thiamine), B3 (niacin), folate, potassium, magnesium, manganese, and phosphorus. High antioxidant activity in coffee is linked to reducing oxidative stress and chronic inflammation.  

So is coffee bad for PCOS … or not so bad?

Of course, you know my answer will be … it depends! This discussion is based on caffeinated coffee versus decaf. The effects of coffee in the body are due to one or more of the following components of coffee: caffeine, the acids, and the antioxidants. Here are the pros and cons. 

PROS of coffee for PCOS

  • Contains disease-fighting antioxidants and anti-inflammatory substances

Surprisingly, coffee is one of the largest sources of antioxidants in American diets. High levels of antioxidants in coffee can protect your body from many harmful free radicals. Antioxidants such as chlorogenic acid, hydrocinnamic acid, and polyphenols in coffee can help lower the risk of many diseases that are caused by oxidative stress, including heart disease and some cancers.

  • Can lower the risk of developing type 2 diabetes

According to Harvard Health Publishing, regular coffee intake may actually reduce your risk of developing type 2 diabetes (however, please note caffeine might decrease or increase blood sugar levels if you already have diabetes). 

  • May boost the metabolic rate

It is easier for you to lose weight when your metabolic rate is higher. Some studies suggest caffeine in coffee may increase metabolism and stimulate fat burning.  Note: I would never recommend you take a supplement with caffeine to aid in weight loss.

  • Can increase levels of sex hormone-binding globulin (SHBG)

Many women with PCOS have low levels of sex hormone-binding globulin (SHBG) primarily due to insulin resistance. Some studies have reported that regular coffee consumption is associated with higher levels of SHBG. (References #1, #2)

  • Improves focus, mood and alertness

You aren’t grabbing that cup of coffee just because it tastes good! Numerous studies have documented that caffeine doses improve focus, mood and alertness.  But more is not better  – as too much caffeine can have negative effects in some people.

  • Enhances physical performance

Consuming caffeine 10-60 minutes before exercise can improve mental focus, alertness, anaerobic performance, and/or endurance performance. (Reference #1, #2, #3)

  • Unknown effects on insulin sensitivity?

The role of caffeine consumption on insulin action is still under debate, however, numerous studies show that caffeine ingestion decreases insulin sensitivity. (References #1#2, #3)  But this study showed that habitual coffee consumption is associated with higher insulin sensitivity. The authors of this study also commented that it could be the antioxidants in coffee that improved insulin sensitivity.


CONS of coffee for PCOS

  • Can increase the stress hormone, cortisol.

Many women with PCOS already have elevated levels of cortisol, so more cortisol secretion is the last thing you want! Elevated cortisol can worsen insulin resistance and raise blood sugar. It can also make you feel jittery and more anxious. The effect varies widely depending on the individual woman. Of note, some women with PCOS have high levels of DHEAS (an androgen precursor made in the adrenal glands. Women with high DHEAS tend to have higher rates of anxiety. So pay attention to how coffee makes you feel. (References #1, #2)

  • May heighten feelings of hypoglycemia

Women with PCOS have increased incidences of hypoglycemia. Caffeine may heighten awareness of hypoglycemia, perhaps because it decreases blood flow and increases the use of glucose in the brain. This may explain my own anecdotal observation that some patients with “functional hypoglycemia” improve when caffeine is eliminated from the diet.  Epinephrine, norepinephrine, and cortisol responses to falling plasma glucose were significantly greater after caffeine ingestion.

  • Speeds transit time in the intestines 

Many women with PCOS complain of gastrointestinal issues. If you tend to have diarrhea, coffee may make it worse. But if you have constipated, coffee can help! So this one can go either way

  • Can worsen heartburn (or GERD)

Many health professionals will tell you to avoid caffeine if you have GERD.  But it doesn’t bother everyone.  Pay attention to how caffeinated beverages make your symptoms feel. Personally, I have GERD and it bothers me if I have cup in the afternoon, but not the morning!

  • May raise blood pressure temporarily

Caffeine can cause a short, but dramatic increase in your blood pressure, even if you don’t have high blood pressure. It’s unclear what causes this spike in blood pressure. So make sure you don’t drink coffee before getting your blood pressure checked!

  • Can disrupt your sleep

High doses of caffeine in coffee can have negative impacts on your total sleep time and quality of your sleep. A study shows that 400 mg of caffeine taken 6 hours before bedtime reduced overall sleep time by more than 1 hour. Many women with PCOS have sleep problems – so this is the last thing you want!

  • May raise estrogen levels more in estrogen dominance

Some women with PCOS have higher levels of estrogen, compared to progesterone. This may cause the endometrium to become excessively thickened, which can lead to heavy and/or irregular bleeding (dysfunctional or anovulatory uterine bleeding). The caffeine in coffee may increase estrogen levels.  This study showed women who consumed an average of 200 milligrams or more of caffeine a day — the equivalent of roughly two cups of coffee — had elevated estrogen levels when compared to women who consumed less (this is due to the caffeine).

  •  Pregnancy

Pregnant women are urged to limit their intake of caffeine to 200mg/day or less.  Although no research has shown that caffeine causes birth defects in humans, we do know that caffeine does cross the placenta and does reach the fetus. A breast-fed child can get caffeine from a nursing mother’s breast milk, which may cause the baby to become fussy.  Therefore, it is good for both pregnant and nursing women to limit the amount of caffeine.

  • Potential toxicity

‘Energy drinks’, ‘energy shots’ and other energy products have exploded in popularity in the past several years; however, their use is not without risk. Caffeine is the main active ingredient in energy drinks, and excessive consumption may acutely cause caffeine intoxication, resulting in tachycardia, vomiting, cardiac arrhythmias, seizures, and death.  Many dietary supplements being promoted for weight loss contain caffeine- or ephedra-related alkaloids to increase energy and suppress appetite. People may be unaware that supplements can contain caffeine, even if caffeine is not listed as an ingredient. Commonly used herbal dietary supplement ingredients, such as guarana, are natural sources of caffeine. Additions of these natural sources of caffeine to dietary supplements have increased in recent years.  (References #1, #2)

Genetics and coffee

To complicate things a bit more, the effects of coffee (caffeine) on your body may be due in part to how you metabolize it. It turns out some people have a gene that causes them to be “slow” caffeine metabolizers while others are “fast” metabolizers. Scientists have identified genetic variants that influence how your body handles caffeine. These variants are located near two genes: CYP1A2 and AHR. Variants in these genes may affect how quickly the body breaks down and clears away caffeine. Many companies such as 23 and me test this gene.  You would likely feel the effects more if you were a slow metabolizer.

Caffeine content of drinks and beverages

  • Coffee, average (check the specific blend & café that you purchase from for specific levels):
  • Brewed, 8 oz.  |  95 – 165 mg
  • Brewed, decaf, 8 oz.  |  2 – 5 mg
  • Espresso, 1 oz.  |  47 – 64 mg
  • Latte, 8 oz.  |  63 – 126 mg
  • Dr. Pepper (12 oz) 37 mg
  • 7 Eleven Big Gulp Diet Coke (32 oz) 124 mg
  • 7 Eleven Big Gulp Coca-Cola (32 oz) 92 mg
  • Baker’s chocolate (1 oz) 26 mg
  • Green tea (6 oz) 40 mg
  • Black tea (6 oz) 45 mg
  • Excedrin (per capsule) 65mg
  • Sourced from the American Pregnancy Association (APA)

Bottom line tips for coffee

So what’s the answer – is coffee bad for PCOS? As you can see, there is no ONE answer. It depends on how it makes you feel. Here’s the scenario you don’t want to have:

Not get enough sleep, feel exhausted and stress, fuel yourself with coffee to get fast energy. This can lead to higher stress levels and anxiety, feelings of low blood sugar, more sleep problems and possibly worsened insulin resistance. Yikes!

So here’s what you can do:

  1. Pay attention to how coffee makes you feel. If you feel jittery or anxious, avoid it – or at least have ½ caf ½ decaf. 
  2. If you love it and it doesn’t have any negative effects in your body, it’s fine to consume in moderation. My suggestion is one cup a day. 
  3. If you have sleep problems, stop caffeine intake from all sources by 2 pm 
  4. Be careful of what you add to the coffee. Avoid sugary “fancy” coffee drinks. Best bet is black or with a little full fat milk (yes, you can have milk with PCOS), or a non-dairy alternative like Nut Pods or Califia. 
  5. If you have estrogen dominance, consider avoiding coffee, or at least limit your intake to 1 cup a day
  6. If you are an anxious person in general, you may want to avoid caffeinated coffee.


How does coffee make you feel?



I especially love problem-solving, whether it’s helping women defeat issues plaguing them for years, helping a busy executive find practical ways to get heart healthy, or providing tips to help you reverse diabetes. That’s why I’m on a constant quest to expand my knowledge by staying on top of the latest research.

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1 Comment

  1. Angela on October 25, 2020 at 8:24 am

    Great article! All in moderation and the idea of 1/2decaf and 1/2caf once a day is a good balance for me personally!

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