Could Blood Sugar Be Causing Your Hormone Imbalance? A Nutritionist Explains the Surprising Link

It’s a two-way street to happy hormones.

By Edie Horstman

There’s no denying the power of proper nutrition. Expert after expert agrees: it can significantly improve your health. Particularly, your hormones. Whether you’re floating through your 20s—or menopause is knocking at the door—your diet can make or break hormone balance. Unfortunately, consuming too many ultra-processed foodsinflammatory oils, and sugars sets you up for a hormonal fiasco. But good news! The solution lies in your eating habits.

If you currently struggle with intense PMS symptoms, PCOS, or other period-related woes, understanding blood sugar and menstrual cycle will change the game. Use food as medicine to bring your body into balance—one plate at a time.

Featured image by Michelle Nash.

Smoothie bowl_blood sugar and menstrual cycle
Image by by Kristen Kilpatrick
Edie Horstman
Edie Horstman

Edie is the founder of nutrition coaching business, Wellness with Edie. With her background and expertise, she specializes in women’s health, including fertility, hormone balance, and postpartum wellness.

Why is hormone health important?

Hormone health—like adequate nutrition—is vital to our well-being. Throughout every stage of life, hormones play a role. They regulate everything from growth to sex drive, reproduction, metabolism, and more. Hormones help control what (and when) certain bodily processes happen. Although very powerful, they’re equally sensitive. Hormones are easily influenced by lifestyle factors: exercise, stress, sleep, and medications. One—or all—of these factors can throw your hormones out of balance. Luckily, you don’t need a PhD to support blood sugar stability and hormone balance.

camille cooking_blood sugar and menstrual cycle
Image by Michelle Nash

The Hidden Thing That Might Be Causing Your Hormone Imbalance

Did you know that an estimated 88% of the U.S. population is metabolically unhealthy? Said differently: only a mere 12% of Americans walk around with optimal blood sugar levels. And balanced blood sugar is is key for almost all human functions—sustained energy, cognitive function, hormone health, longevity, and more. Whether or not you’ve heard of blood sugar, consider it an under-appreciated window into your overall health. Is blood sugar driving your hormone imbalance? Read on to learn more.

pre workout smoothie_blood sugar and menstrual cycle
Image by Michelle Nash

Blood Sugar and Insulin: A Lock and Key

If you’re new to understanding blood sugar, let’s break it down. When you eat carbohydrates, they’re broken down into glucose (sugar). Your bloodstream transports this sugar to your cells. And boom, you’ve got fuel to burn. But in order to get into the cells, where glucose can be used for energy, the pancreas needs to release insulin. Insulin is the hormone that shuttles glucose where it needs to go. When it works properly, all is good. Insulin makes sure your blood glucose levels aren’t too high or too low.

Is it better to be insulin resistant or insulin sensitive?

When your blood sugar is chronically high, your body slowly becomes less sensitive to insulin. This is known as insulin resistance. And in many ways, it’s not the goal. Instead, you want to be insulin sensitive. (Tips on how to achieve this, below.) Unfortunately, when you’re insulin resistant, it takes more and more insulin to shuttle circulating glucose into your cells. In turn, this causes blood sugar imbalance and a host of menstrual cycle imbalances

pizza party
Image by Michelle Nash

How do I know if my blood sugar is too high?

While you can use a continuous glucose meter (which is wildly helpful), there are certain symptoms that accompany imbalanced blood sugar. You may have chronically elevated blood sugar/insulin if these sound familiar:

  • Fatigue, particularly after meals
  • Inconsistent energy
  • Regular, strong sugar cravings
  • Feeling anxious between meals
  • Trouble losing weight
  • Frequent hunger
  • Sleep issues (falling asleep or staying asleep)
  • Missing or irregular period
  • Intense period cramps

By contrast, when your blood sugar is balanced, you’ll feel consistent energy throughout the day, minimal cravings, better sleep, energy in the mornings, a stable mood, and less PMS.

To know for certain if your blood sugar is in range, schedule an appointment with your PCP or healthcare provider to get your A1C tested. This will give you an understanding of your blood sugar over the past three months.

woman in bedroom, blood sugar and menstrual cycle
Image by Jenn Rose Smith

How Blood Sugar Impacts Female Hormones 

So, how does blood sugar relate to your menstrual cycle? Study after study show that blood sugar impacts all female sex hormones. When insulin is elevated—aka blood sugar levels are high—it puts stress on the body. This causes a spike in cortisol and this spike has a ripple effect on other hormones. Since progesterone and testosterone compete for the same receptor sites, high cortisol causes low progesterone. This leads to symptoms like heavy periods, migraines, anxiety, acne, PMS, estrogen dominance, endometriosis, and more.

Elevated Blood Sugar and Ovulation

Furthermore, your ovaries also have insulin receptors! Meaning, elevated insulin can cause the ovaries to produce more testosterone. This ultimately impacts—or entirely stops—ovulation. It causes issues like PCOS and irregular periods. Elevated insulin also lowers SHBG (sex hormone-binding globulin), which contributes to both high estrogen and testosterone—in turn, causing symptoms like tender breasts, heavy periods, and uterine fibroids. As you can see, blood sugar and menstrual cycle are a tight web.

woman journaling
Image by Michelle Nash

Each Phase Of Your Cycle And How It Affects Blood Sugar

As women, the natural ebbs and flows of our hormones affect blood sugar (and insulin sensitivity). Curious to know what’s happening to your blood sugar in relation to your menstrual cycle? Let’s look at the entire cycle, starting with the first day of your period.

Days 1-7: Hello, period! You may experience higher blood sugar levels and insulin resistance on the first few days, but insulin sensitivity should revert back to normal for the rest of your period, and a few days after it ends.

Days 11-14: During ovulation, you may experience higher (and somewhat erratic) blood sugar levels and insulin resistance. As your body prepares to release an egg, hormones rise, which can cause a spike in your blood sugar. This lasts 2-3 days.

Day 15-20: Blood sugar typically balances itself out (with the support of proper nutrition) at the start of the luteal phase.

Day 21-28: This is the point in your cycle, known as the mid-luteal phase, where you’re more likely to experience significant insulin resistance and higher blood sugar levels. This isn’t uncommon before your period starts again. During this time, prioritize healthy fats, protein, and fiber with each meal.

Keep in mind that every woman’s cycle is different and it is normal for lengths to vary. Your cycle may be longer or shorter than the phases listed above.

Spicy Salmon bowl_blood sugar and menstrual cycle
Image by Michelle Nash

Simple Tips For Balancing Hormones

Working with the natural rhythms of your cycle, there are simple, effective habits you can instill to balance blood sugar.

1. Don’t cut carbs

There’s no need to go keto! In fact, I don’t recommend this (long-term) for women. Instead, keep your plate balanced. When having a bowl of pasta, try to choose 100% whole grain pasta, or an alternative like a chickpea or lentil-based pasta. Additionally, add protein and healthy fat. This could look like having grilled chicken on the side, sautéed shrimp, as well as a pesto-based sauce. Protein and fat don’t cause the same blood sugar spike as carbs, so they’re helpful to have on your plate.

2. Manage your stress

As mentioned, chronic stress causes blood sugar to increase. Beyond implementing mindfulness practices during the day and minimizing your stress triggers, consider these stress-relieving products.

3. Get quality sleep

Clock your zZz’s. Getting quality sleep (7-9 hours) is essential. Poor (or little) sleep causes cortisol and blood sugar to rise. Here are helpful ideas for a calm nighttime routine. Along with doing a nighttime meditation and turning off your devices, you may also benefit from limiting these foods before bed.

4. Move your body

Last but not least, move your body. This doesn’t mean you need to begin a daily HIIT routine. In fact, that may cause more harm than good. Instead, opt for 15-30 minutes of strength training, go for a brisk walk, unroll your yoga mat, or dance in your kitchen. Anything you can do to get your blood circulating and your muscle fibers firing will support your blood sugar.