The Link Between Cortisol & Weight Loss

By Leah Kleinschrodt, MS, RD, LD
May 18, 2026

Originally written in February 20, 2019. Updated and revised in 2026

When I think about the stress-cortisol-nutrition connection, I can't help but think about a client I met with about a year ago. This client's primary nutrition goals were to put an end to her cravings, and to reduce the belly fat gain that had been creeping up on her.

As we delved into her story, we discovered that she was a breastfeeding mom, a business owner, exercised at high intensity 6-7 days per week (and sometimes several times per day), and was sleeping only 3-5 hours per night. Whew, talk about high stress!

She was also eating out and reaching for convenience foods more often than she had in the past. We discussed the toll these accumulated stressors were taking on her body, and how high levels of the stress hormone cortisol were causing her weight gain, specifically in her midsection. I could see a dawning of realization on her face, so we sat down and created a plan to help her start reducing her daily cortisol level, starting with a balanced nutrition plan.

The Scientific Connection Between Stress and Cortisol

Humans have encountered stressors as far back as our primitive days. The main stressors of our ancestors usually involved short bursts of fighting, hunting for their next meal, or fleeing from the jaws of a hungry lion. Fast forward to today, our “lions” now come in many different, sometimes unrecognized, forms:

• “Needing” a whole pot of coffee or a 16-oz energy drink to accomplish the day's to-do list

• Skipping breakfast (or any meal for that matter!)

• Constant email and text notifications from our cell phones. In fact, a study published in 2015 identified SIX different ways that smartphones produced a stress response in the participants, including anxiety of missing out on valuable information, and the pressure of responding in real-time!1   

• Financial concerns

• Our kids' (or our own) packed activity schedules

• Being a caregiver for a loved one

• Long commutes or rush-hour traffic

• Giving a presentation or sales pitch at work

• An alarm clock that goes off after only 5 hours of sleep

• The ever-looming question of “What's for dinner?”

Can you relate to any of these? The problem is, our bodies don't know the difference between a life-or-death chase with lion and a crabby boss. Our bodies still respond the same way: releasing our main stress hormone, cortisol, to help us deal with the situation at hand.

Cortisol is an example of a “Goldilocks” hormone: we don't want too much cortisol or too little cortisol, we want it just right.

Cortisol is actually beneficial for us in the short-term; it gives us a burst of strength, energy, focus, and even temporarily boosts our immune system. However, our daily fast-paced lives and constantly facing our “lions” means that cortisol is being released all day long, day after day.

Over time, high cortisol throws our blood sugar level out of whack, interrupts our sleep (ever had that “tired but wired” feeling?!), leads to feelings of anxiety and depression, and affects wound healing.

Chronically high stress levels can even cause us to age quicker. A 2004 study in healthy premenopausal women showed that those women with the highest perceived chronic stress levels had shorter telomeres (DNA protein complexes) compared to low-stress women – all in all, this averages the equivalent of at least 10 years of additional aging.2

Increased cortisol disrupts sleep quality, impairing the body’s ability to regulate hunger hormones and repair muscle. It also slows wound healing by suppressing the immune response and reducing inflammation control, making recovery from injuries take longer. Chronic sleep deprivation increases stress, reduces immunity, and makes it more likely you'll be overweight.

Elevated cortisol levels also creates more belly fat

Why? One reason is that we have more cortisol receptors in our abdominal adipose tissue than in other areas of fat storage! In other words, our bellies have four times more “doorways” for cortisol to act on our fat cells.

Cortisol also increases our blood sugar level temporarily, giving us quick energy to “fight-or-flight” the stressor at hand. Unfortunately, this rise in cortisol production is quickly followed by a blood sugar drop, which leaves us feeling tired, hangry (hungry and angry), craving sugar, and MORE STRESSED!

Once in a low blood sugar state, cookies and donuts in the breakroom look way more appealing than the steak, green beans, and butter you brought for lunch. Can you see the vicious cycle and how this cycle may lead to weight gain, particularly that stubborn belly fat? 

How do you know your cortisol levels?

Knowing your cortisol levels can be a game-changer when it comes to managing stress and supporting your weight loss efforts. Since cortisol fluctuates throughout the day, a single measurement might not tell the whole story. Typically, cortisol is highest in the morning to help you wake up and lowest around midnight to support restful sleep.

If you notice symptoms like increased abdominal fat, increased appetite, carbohydrate cravings, trouble sleeping, brain fog, or feeling constantly stressed and fatigued or depleted, your cortisol levels might be dysregulated. The best way to get an accurate picture is through testing. This can include saliva, blood, or urine tests that measure cortisol at multiple times during the day to capture its natural rhythm.

Cortisol Management with a Nutrition-First Diet

While there are certainly unforeseen event and stressors that we have no control over, we do have choices when it comes to what we put in our mouths each day.

How do you get rid of cortisol to lose weight?

Luckily, there are a number of things you can do with your nutrition to reduce high cortisol levels and help manage weight gain.

First and foremost, keeping your blood sugar level balanced and steady throughout the day helps regulate cortisol levels. To do this, we teach our clients to eat a mix of protein, real-food carbs, and healthy fats several times per day. Most of our client need to eat this combination every 3-4 hours. This prevents our blood sugar from going too high or too low, which in turn prevents a stress response.

Eat This, Not That To Reduce Cortisol:

• Eat enough protein, usually 4-6oz per meal and 2-3oz per snack. Quality proteins, like meats, eggs, fish/seafood, and dairy, break down into amino acids. These amino acids are then used to make our feel-good, anti-stress neurotransmitters like serotonin and dopamine and GABA. Protein is also an "anchor" for our blood sugar, and steady blood sugar helps balance the body's stress response and lower cortisol levels.

• Choose real fats like butter, coconut oil, avocado oil, avocadoes, dry roasted nuts/seeds, heavy cream, cream cheese, and olives. Our brains are 60-70% fat, so real fats help us think better and have good moods. Like protein, real fats also "anchor" our blood sugar, which lowers cortisol levels.

• Remove troublemakers like sugar, processed foods, refined oils, alcohol, caffeine, and potential food sensitivities from your diet. The most common foods we see clients are sensitive to are gluten and dairy. These foods increase cortisol by activating the body's immune response, triggering inflammation and stimulating the adrenal glands to release more cortisol.

• Sleep 8-9 hours per night. Cortisol should be at its lowest around midnight, and sleep is our time to rest, relax, and repair. There are many nutritional solutions to sleep issues, but eating a snack before bed is the first line of defense. This helps keep blood sugars stable through the night and keeps cortisol at bay.

• Magnesium is my favorite stress-busting mineral! When you think magnesium, think relaxation: magnesium helps our bodies control blood sugar, reduce blood pressure, reduce anxiety, relax our muscles, promote sleep, and much more. 400-600mg of our Magnesium Glycinate or Mixed Magnesium products does just the trick for many of our clients.

How do you know if you are reducing your cortisol levels?

Tracking your progress in lowering cortisol can sometimes feel tricky because the hormone fluctuates throughout the day and impacts many aspects of your body. However, there are some clear signs that your efforts to reduce stress and balance cortisol are working:

• Improved sleep quality: You’ll notice falling asleep more easily, staying asleep longer, fewer night wakings, and waking up feeling refreshed. Since cortisol should be lowest at night, better sleep is a strong indicator that your cortisol levels are evening out.

• Reduced cravings and more stable appetite: When cortisol levels lower, your blood sugar stabilizes, helping you avoid sudden hunger pangs and cravings for sugary or fatty foods. You’ll find it easier to stick to balanced meals without feeling “hangry.”

• Less belly fat and improved body composition: Because cortisol affects fat storage, especially around the midsection, a reduction in abdominal fat or a slowing of belly fat gain suggests your cortisol is becoming more balanced.

• Increased energy and improved mood: Lower cortisol often means less anxiety and stress, resulting in better focus, a calmer mind, and more energy throughout the day.

• Better digestion and fewer stress-related symptoms: You might notice fewer headaches, less muscle tension (especially around the shoulder blades and neck), and improved gut health as your body’s stress response calms down.

If you’re seeing these positive changes, it’s a good sign your nutrition and lifestyle adjustments are helping to lower cortisol. Remember, consistency is key—keep prioritizing balanced meals, quality sleep, stress reduction, and moderate exercise to maintain these benefits.

With these strategies in mind, you are well on your way to warding off the stress and cortisol response before it even begins. Listen in to a Dishing Up Nutrition podcast episode, The Cortisol Connection to Weight Gain to learn even more strategies.

If you're a bit lost about what to eat, consider a phone or in-person nutritional counseling meeting with one of our knowledgeable dietitians and nutritionists to help you create a game plan and put it into action.

References

1. http://aodr.org/xml/04150/04150.pdf

2. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC534658/