By Ava Durgin
September 26, 2026
Hold up, before you get too far, this is not the article you think it’s going to be.
Most readers clicking into a wellness feature about intermittent fasting expect a familiar narrative: the testimony that skipping breakfast changed someone’s life, that pushing back the first meal of the day was the ultimate productivity hack, or that a dream physique was manifested through the magical power of a strict eight-hour eating window. For a long time, the author of this piece would have written exactly that article. The weight was lost, and the routine felt like cracking a hidden code to modern health.
Yet behind the initial metrics of success came a quiet collapse of foundational wellness: a total drain on energy, a vanished motivation to work out, and the eventual cessation of a regular monthly cycle.
Consequently, this is not the fasting success story many might expect. In the current daily routine, breakfast has reclaimed its spot as a favorite meal, consumed within thirty minutes of waking up—sometimes even before seven in the morning. Looking back at the former self who used to chug black coffee and sprint to a six-thirty strength training session on an empty stomach feels like looking at a stranger. But in hindsight, listening to those physiological warning signs much sooner would have prevented a cascade of stress-induced health complications.
What is intermittent fasting, anyway?
For those newer to the concept, intermittent fasting centers entirely on the timing of daily food intake—designating specific hours as a "feeding window" and others as a period of fasting. The most popular version, known as the 16:8 method, requires fasting for sixteen hours while condensing all daily calories into an eight-hour window, such as from noon to eight in the evening. During the fasted state, the body is thought to shift its primary fuel source from circulating glucose to burning stored body fat. A growing body of scientific literature suggests this metabolic shift can support overall metabolic health, assist with blood sugar regulation, and aid in weight management.
The underlying science remains real and compelling. However, a significant caveat exists: the vast majority of that foundational research was conducted primarily on men or on mixed-sex groups without analyzing the outcomes broken down by sex. As emerging clinical discussions highlight, that distinction matters enormously, particularly when considering how different biological systems respond to prolonged periods without food.
Why it’s not always the best for women
Women’s physical health relies heavily on a tightly regulated network of hormones—including estrogen, progesterone, luteinizing hormone, and follicle-stimulating hormone—that must work in concert to maintain a stable and regular menstrual cycle. This delicate endocrine system is exceptionally responsive to environmental and physiological stress signals. When prolonged fasting is introduced into a daily routine, especially when combined with intense physical exercise, the body often interprets the combination as a major stress event.
The physiological mechanism behind this reaction involves the hypothalamic-pituitary-adrenal, or HPA, axis, which serves as the central command center for the human stress response. When an individual skips breakfast and immediately dives into a heavy morning workout, cortisol levels experience a sharp spike. Cortisol is not an inherently negative hormone; it serves the vital evolutionary purpose of mobilizing stored energy to meet immediate demands. However, when cortisol remains chronically elevated day after day—fueled by consecutive fasted workouts—it begins to actively suppress reproductive hormones.
In an evolutionary act of self-preservation, the body essentially decides that the current environment is unsafe for reproduction, subsequently dialing down the hormonal signals required to drive a normal menstrual cycle. This biological response explains why many women experience irregular periods or lose them entirely when engaging in aggressive fasting or chronic under-eating. Furthermore, emerging medical research suggests that women may experience more pronounced blood sugar swings and sharper cortisol responses to fasting protocols compared to their male counterparts.
None of these findings imply that intermittent fasting is inherently malicious or universally flawed. Rather, it highlights that wellness strategies are not one-size-fits-all. For many women—particularly those who lead active lifestyles, manage high daily stress, or inadvertently under-fuel their bodies—fasting can easily tip the delicate biological balance in the wrong direction.
What my routine used to look like
A typical day used to begin with an alarm blaring at six in the morning, followed by a direct beeline to the kitchen not for food, but for black coffee. Out the door by six-twenty and arriving at the gym by six-thirty, the next hour consisted of heavy lifting and intense cardio performed on a completely empty stomach. A hurried shower, getting dressed, and navigating the morning commute eventually led to the first meal of the day around eleven in the morning. Two full meals and a single snack would be jammed awkwardly into an eight-hour window, followed by total restriction until the following morning. Rinse and repeat.
To be fair, there were undeniable upsides to this structured rigidity. Navigating a busy, chaotic season of life meant that eliminating the need to think about morning food streamlined a hectic daily routine. During periods of travel, the flexibility proved to be a lifesaver—there was no need to scramble for an airport breakfast or feel guilty about a hotel’s sparse continental spread. And, quite frankly, observing early changes in body composition served as a powerful psychological motivator to keep going.
Unbeknownst to the person living it, however, that routine was driving cortisol levels to extremes, maintaining a chronic state of biological stress. The long-term toll manifested as persistent brain fog, unusual irritability, profound physical fatigue—often requiring bedtime as early as eight-thirty in the evening just to cope—and deeply deregulated hormones. At the time, that state of exhaustion simply became the accepted baseline normal. Looking back, the physical body was trying to sound an alarm, but those signals were repeatedly ignored in the pursuit of wellness metrics.
What my routine looks like now
The ultimate turning point arrived through a combination of cumulative wake-up calls: yet another month without a menstrual cycle, an honest conversation with a physician, and a critical evaluation of what was actually being done to the physical body in the name of health. Something fundamental had to change.
Taking a leap that once felt completely unthinkable, the daily routine shifted to include breakfast. Initially, the adjustment felt bizarre, as though an unbreakable rule honed over years of strict adherence was being violated. Yet within just a few weeks, a remarkable psychological shift occurred: mornings became something to look forward to because food was back on the table. Experimenting with new smoothie recipes and overnight oats transformed the start of the day.
Providing the body with proper fuel yielded immediate physical rewards. The menstrual cycle returned. Energy levels stabilized. Workouts began to feel restorative rather than depleting, leaving enough stamina to comfortably navigate the remainder of the day without a severe afternoon crash.
Current mornings still begin early, but rather than rushing out the door fueled solely by black coffee, the first meal is consumed within thirty minutes of waking up—sometimes even earlier if true hunger calls. Most days feature a substantial bowl of Greek yogurt topped with blueberries, raspberries, homemade granola, and a generous spoonful of chia seeds. On mornings when savory cravings take over, the kitchen yields a plate featuring two eggs fried in a little olive oil, chicken sausage, sautéed spinach, and warm sourdough toast.
How to build a nourishing and satiating breakfast
Designing a balanced morning meal starts with prioritizing protein, which serves as the foundational anchor of the plate. Protein plays a critical role in stabilizing blood sugar levels, supporting post-workout muscle recovery, and promoting prolonged satiety throughout the morning hours. Excellent sources include whole eggs, Greek yogurt, cottage cheese, or even repurposing leftover protein from the previous night’s dinner.
Layering in healthy fats comes next, incorporating ingredients like chia seeds, sliced avocado, or the natural fats found in whole eggs to further assist with satiety and support healthy hormone production. Additionally, embracing quality carbohydrates—such as rolled oats, fresh berries, or artisan sourdough—provides the body with the immediate, accessible energy required to start the day, particularly for active individuals.
The takeaway
Intermittent fasting is not a universal villain, and acknowledging its drawbacks is not meant to invalidate the experiences of those who practice it successfully. For certain individuals—particularly those who avoid intense fasted workouts, manage moderate stress levels, and find themselves outside their peak reproductive years—a condensed eating window can feel entirely manageable and beneficial without triggering hormonal consequences. Every human body is unique, and learning to listen closely to individual physical feedback remains paramount.
That lesson is ultimately what the past self needed to hear: stop dismissing natural hunger, embrace necessary rest days, and eat breakfast. Fueling the body adequately before demanding physical or mental performance is never a sign of weakness or a lack of discipline. For many, ensuring proper morning nourishment stands out as one of the healthiest, most empowering choices possible.
