In middle age, women often experience a shift toward “fight or flight” dominance due to declining estrogen and increased cortisol. Activating the Parasympathetic Nervous System (PSNS)—the “rest and digest” mode—is essential for managing perimenopausal symptoms, protecting heart health, and maintaining a healthy metabolism.
Here is how to promote this state through targeted physical, nutritional, and lifestyle shifts.
This week’s challenges to promote better digestion are:
1-Create a restful environment for meals. Think about how nice restaurants have table cloths, candles, soft music etc. No distractions while eating for 1 week!
2-Move for 15 min within 1 hour of eating a meal (walk, stretch, yoga, lift etc)
3-Close the kitchen for 12 hours. Stop eating for 12 hours-No longer
1. Meal Time Hygiene
Digestion cannot happen effectively if you are stressed. Middle-aged women often face more bloating and “slow” digestion; these habits help:
- The “Five-Breath” Rule: Before your first bite, take five deep belly breaths. This shifts your body out of “rush mode” and prepares the stomach for acid production.
- Mindful Chewing: Aim for 20–30 chews per bite. Saliva contains enzymes that start the digestive process; rushing this step forces the stomach to work harder.
- Bitter Foods: Start meals with “bitters” (like arugula, radicchio, or a teaspoon of apple cider vinegar in water). These stimulate the bitter receptors that trigger bile and enzyme release.
- Eliminate “Distracted-Eating”: Eating while reading, working or scrolling keeps the sympathetic nervous system active, leading to indigestion and poor nutrient absorption.
2. Targeted Nutrition for the PSNS
Certain nutrients act as “brakes” for the nervous system:
| Nutrient | Benefit for Middle-Aged Women | Best Sources |
| Magnesium | Known as the “relaxation mineral,” it helps with sleep and muscle tension. | Pumpkin seeds, spinach, dark chocolate, almonds. |
| Omega-3s | Reduces neural inflammation and supports “vagal tone.” | Salmon, sardines, walnuts, chia seeds. |
| Probiotics | A healthy gut-brain axis is vital for a calm nervous system. | Kimchi, kefir, sauerkraut, Greek yogurt. |
| Potassium | Helps regulate heart rhythm and counteracts salt-induced stress. | Bananas, avocados, sweet potatoes. |
3. Move After Eating
- “Movement Snacks”: A 10-minute slow walk after dinner (the “postprandial stroll”) is one of the most effective ways to lower blood sugar and aid digestion.
- Restorative Yoga: Poses like “Legs Up the Wall” (Viparita Karani) for 5–10 minutes before bed can drain the lower extremities and deeply quiet the nervous system.
- The “Buffer Hour”: Create a 60-minute window before bed with no blue light or stressful emails.11 This allows melatonin to rise and the PSNS to take over for overnight repair.
The Stacy Sims Recommendation: Why 12 Hours
For most women in midlife, Dr. Sims recommends “Circadian Eating” rather than Intermittent Fasting. This means:
- The Window: Aim for roughly 12 hours of fasting overnight (e.g., finishing dinner by 8:00 PM and eating breakfast at 8:00 AM).
- The Focus: Aligning food intake with your natural circadian rhythm and daytime activity levels rather than stretching the fast into the late morning.
Why she advises against longer windows (like 16+ hours):
- Cortisol Spikes: Middle-aged women already face higher baseline cortisol due to declining estrogen. Extending a fast until noon creates additional “starvation stress,” which keeps cortisol elevated.1 This tells the body to store fat (especially around the midsection) and break down muscle for fuel.2
- Kisspeptin Sensitivity: Women have higher levels of kisspeptin, a neuropeptide that regulates ovulation, metabolism, and appetite.3 It is highly sensitive to energy intake.4 When the brain perceives a nutrient deficit (as in a long fast), it downregulates kisspeptin, which can further disrupt hormones and slow the metabolism.5
- Muscle Protein Synthesis: In menopause, women become “anabolic resistant,” meaning it’s harder to build and keep muscle.6 Dr. Sims emphasizes that skipping breakfast makes it almost impossible to hit the high daily protein targets (approx. 1.8g to 2.2g per kg of body weight) required to protect muscle mass.7
- The “Fed State” Requirement: She famously advocates for women to “train fed, not fasted.” If you exercise in the morning, she recommends having at least a small amount of protein (like a protein coffee or a few bites of Greek yogurt) before your workout to signal to the brain that there is plenty of energy available.8
Summary of her “Ideal Day” for Midlife Women:
- Eat Breakfast: Eat within 60–90 minutes of waking to lower morning cortisol.
- Fuel the Work: Always eat before and after exercise.9
- Front-Load Calories: Eat the majority of your calories during the day when you are most active.
- Close the Kitchen: Finish your last meal about 2–3 hours before bed to allow for a 12-hour rest period that supports digestion without triggering a stress response.
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