How Stress Affects Digestion and Nutrient Absorption (And What Helps)

You eat the salad. You take the supplements. You do everything you're supposed to do, and you're still bloated, still tired, still not feeling like yourself. 

Dr. Meg Mill, a Doctor of Clinical Pharmacy and functional medicine practitioner, says the missing piece often isn't what's on your plate. It's the state your body is in when you eat it, and the thoughts running in the background that keep telling your body it's in danger.

 

This is for you if you've been thinking:

  • I eat pretty healthy, but I still feel bloated after most meals.

  • I usually eat standing at the counter, in the car, or at my desk while I work.

  • I take a lot of supplements and I'm not sure they're actually doing anything.

  • My wearable says I'm stressed even when I don't feel stressed.

  • I'm kind to everyone else, but the way I talk to myself is pretty harsh.

  • I've seen a lot of practitioners and no one is looking at the whole picture.

  • I want to know if stress can actually affect how well I digest my food.

 

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Digestion Starts in Your Brain

Most people know Pavlov for his dogs and the bell. Fewer know that he won the 1904 Nobel Prize for his research on the physiology of digestion. The conditioned response came out of that work, but his bigger contribution was showing that digestion doesn't start in your stomach. It starts in your brain. 

Researchers call this the cephalic phase of digestion: as you see, smell, and anticipate food, your brain starts signaling your digestive system to get ready. That means your mental state at the moment you sit down to eat is part of digestion, not separate from it.


Why Stress Shuts Down Digestion

Your autonomic nervous system runs the things you don’t have to think about, like your heart rate, digestion and, most of the time, your breathing. Two of its branches work like a balancing act. The sympathetic side drives fight or flight, built to keep you alive when there’s a threat. The parasympathetic side supports rest and digest. A third branch, the enteric nervous system, lives in your gut and manages digestion itself, taking cues from the other two.

Meg explains that in rest and digest, your body gets the signal to release digestive enzymes from the pancreas, bile from the gallbladder, and stomach acid, and to move food through your system.

When you're in fight or flight, your body pulls resources away from digestion and sends them elsewhere, like your limbs so you can run. The problem is that your stress response doesn't have a setting for "full inbox." It can't tell the difference between a lion chasing you and the running thoughts of "I'm late, I have a million things to do, I'm not good enough." 

If those thoughts are on repeat, your body can spend a lot of time in a state that doesn't prioritize digesting your food. And you might not even feel stressed. Many people notice on their wearables that their body shows signs of stress during stretches when they felt fine.


Why Doing Everything Right Might Not Be Adding Up

Meg describes this as upstream versus downstream. Downstream, you might be eating the perfect plate and taking well-chosen supplements. But if your body can't digest and absorb what you're eating, you're not getting the full benefit.

She uses hormones as an example. A woman in perimenopause with symptoms that look like estrogen dominance may be given a supplement to help clear estrogen. If it doesn't work, Meg's approach is to go upstream: Is she eliminating well, or is she constipated? Is she digesting and absorbing the nutrients her body needs to make hormones? And is her body getting the signal that it's safe to do all of that? In her view, many women aren't failing because they're doing the wrong things, but because they're skipping the foundation.


How Your Thoughts Keep Your Body on High Alert

Meg's starting point is simple: notice how much chatter is going on in your head. Most of us are endlessly supportive of our friends and much harder on ourselves. If someone else spoke to you the way you speak to yourself, you'd feel threatened, and your body responds to that internal voice the same way.

She also teaches looking for the thought beneath the thought. Surface thoughts can seem harmless. "I'm always late" doesn't sound like a big deal. But ask why it matters ("because I'm letting down people I love") and why that matters, and you often land on a core belief like "I'm not good enough." Those core beliefs are the ones Meg says keep sending your body the wrong signals.


What Is the Seven Second Switch?

The Seven Second Switch is Meg's method for interrupting these thought patterns, built on neuroplasticity, the brain's ability to form new pathways. She compares old thought patterns to highways you've driven for years and new ones to walking through tall grass. With practice, the new path becomes the road you take.

The steps: recognize the thought and dig to its core, notice where you feel it in your body, question whether it's true, physically move it out of your body (brushing it off or shaking it out), replace it with a neutral thought, and reset your nervous system. The replacement thought is intentionally neutral, not a big affirmation your brain won't believe. Something like "I'm okay right here in this moment." It takes a few minutes while you're learning it, and Meg says it gets faster with practice. Expect your mind to snap back to the old thought at first. That's normal. Repetition is how the new pathway forms.

One addition Jessica uses: instead of only asking "is this true?", ask "could something else be true?" Arguing for every other possibility tends to soften the original belief until it loses its grip.


What to Do Before You Eat

Meg's simplest recommendation is also the easiest to skip. Sit down to eat. Take a few deep breaths before you start. Look at your food. Give your body the message that it's time to eat, not time to run. Then notice whether anything changes, like less bloating after meals.

She's clear that sometimes deeper work like stool testing or rebalancing the gut is needed. But she has also seen women for whom changing the input, both the environment they eat in and the messages they give their body, made a real difference on its own.

FAQs

Can stress affect your digestion?

Yes. Digestion is controlled in part by the autonomic nervous system. In the parasympathetic "rest and digest" state, your body supports digestive functions like releasing enzymes and stomach acid and moving food through your gut. Under stress, the sympathetic "fight or flight" response takes priority, and digestion becomes less of a focus. Functional medicine practitioner Dr. Meg Mill points out that the stress response can be triggered by repetitive negative thoughts, not just by obvious stressful events.

Why am I bloated after eating healthy food?

Bloating has many possible causes, so if it's persistent it's worth talking to a practitioner. One factor that often gets overlooked is the state you're in when you eat. Eating quickly, standing up, or while stressed may make it harder for your body to digest well. Dr. Meg Mill suggests a simple experiment: sit down for meals, take a few deep breaths before eating, and notice whether your symptoms change.

What is the cephalic phase of digestion?

The cephalic phase is the first phase of digestion, and it starts in the brain. When you see, smell, or think about food, your brain begins signaling your digestive system to prepare, including the start of saliva and stomach acid secretion. Much of the early research on it came from Ivan Pavlov, who won the 1904 Nobel Prize for his work on the physiology of digestion. It's one reason your mental state at mealtime matters.

How do I get into rest and digest before eating?

Start with your environment. Sit down to eat instead of eating on the go, put your phone and laptop away, and take a few slow breaths before your first bite. Slow breathing with a longer exhale is one of the most direct ways to signal your parasympathetic nervous system. Taking a moment to look at and smell your food also supports the cephalic phase of digestion.

Meet Dr. Meg Mill:

woman with brown hair and brown eyes wearing white shirt and camel blazer smiling

Dr. Meg Mill is a Doctor of Clinical Pharmacy and Certified Functional Medicine Practitioner with over 20 years of clinical experience.

Through her global virtual functional medicine practice, she helps women with chronic fatigue, hormonal imbalances, digestive disorders, and histamine-related conditions.

She is the founder of the Women's Functional Health Institute, where she trains Certified Women's Functional Health Coaches, and the author of The Seven Second Switch.

 

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Disclaimer:

Belong Wellness and its members, managers, employees, contractors, and other agents or representatives are not licensed medical care providers and do not provide medical services or advice, including without limitation diagnosing, examining, preventing, treating, or curing any medical conditions. The information shared in this podcast is meant to be educational, not prescriptive. Please consult your medical doctor before making any changes to your diet or lifestyle. Further, the opinions of guests on this show do not necessarily reflect the opinions of Jessica or anyone affiliated with Belong Wellness.




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Hi! I’m your host, Jessica.

I am a trauma-informed breathwork facilitator, certified menopause coaching specialist, Pilates instructor, mom of two and long-time health nut here to help you feel informed, connected and badass during this wild stage of life.

 
 
 

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