Why You're So Tired: The Bucket, the Holes, and What Actually Refills You
Over the years, woman after woman has sat across from me describing the same story. Low energy. Not just physical exhaustion, but a mental fatigue that makes even simple decisions feel overwhelming. For some the decline was gradual. For others it felt like being hit by a freight train. However it began, the pattern is remarkably consistent.
It usually sounds like this: after my last pregnancy, or that surgery, or that stressful season, I never really bounced back. I used to exercise, but now I have no motivation. I have gained weight and lost confidence, and I cannot tell if I am too exhausted to try or just discouraged because nothing seems to work.
Hear me on this. That is not laziness. It is not a lack of discipline. It is almost always the result of cumulative stress.
Your body was built for short bursts, not endless stacking
The body is designed to adapt to short bursts of stress. A surgery. A demanding project. A sleepless week with a newborn. In the short term, your body compensates beautifully. Hormones rise to meet the demand, blood sugar adjusts, and inflammation does its job and then resolves.
The problem is not one stressor. The problem is stacking them. Physical stressors include inflammation, illness, pain, poor sleep, toxins, and unstable blood sugar. Emotional stressors include relational strain, financial pressure, caregiving demands, unresolved trauma, and the constant mental load so many women carry. Some women tell me, "I'm handling it." And they are. But handling something does not mean it is not costing you.
The bucket and the holes
Picture your energy reserves as a bucket. What fills it are adequate nutrients, balanced sex hormones, healthy thyroid function, and appropriately regulated cortisol. When those systems are supported and your daily rhythms are healthy, the bucket stays full. You handle challenges, you recover, you adapt.
Chronic stress acts like holes in that bucket. One hole is manageable, and the body compensates. But as more holes appear and go unaddressed, the system can no longer keep up. Production falters, resilience drops, and symptoms surface. Fatigue is usually the first signal.
What actually fills the bucket
Energy is not simply a matter of willpower or positive thinking. It is built on specific biological systems God designed to run in rhythm and balance. When key nutrients are depleted or hormones fall out of alignment, the body cannot sustain vitality no matter how determined you are.
On the nutrient side, these are the deficiencies I most often evaluate when a woman comes in with low energy: iron and its storage form ferritin, which carries oxygen and is frequently low in menstruating women; B12 and folate, which support red blood cells, nerve function, and mental clarity; vitamin D, one of the most common deficiencies I see; magnesium, which is central to energy production, sleep, and the stress response; CoQ10, which fuels the mitochondria and declines with age and certain medications; iodine, which the thyroid needs; and omega-3 fats, which calm inflammation. If the gut cannot absorb what it needs, fatigue is almost inevitable, which is why nutrition is the second pillar for a reason.
Hormones decide how that energy is used
Nutrients fill the bucket, but hormones regulate how the energy is produced, distributed, and sustained.
Under stress, the adrenal glands raise cortisol to keep you going. In the short term that is protective. The trouble starts when stress becomes chronic and the hypothalamic-pituitary-adrenal axis gets dysregulated. As cortisol demand stays high, the body starts reallocating resources. Thyroid conversion can suffer, especially the conversion of T4 into the active form T3. The sex hormone pathway rarely escapes either, as the body prioritizes cortisol in a process often called pregnenolone steal. Chronically high cortisol also nudges the body toward insulin resistance, which erodes energy further.
Two more players deserve attention. Suboptimal thyroid function is one of the most common and most overlooked causes of declining energy in women, and it shows up as a heavy kind of exhaustion, brain fog, weight that will not move, constipation, hair loss, and never feeling warm. And testosterone, present in women at much lower levels than in men, is one of the most underestimated hormones there is. It supports energy, motivation, muscle, focus, and libido, and when it drops, most women never realize it because no one told them it mattered.
If you have been white-knuckling your way through the day and blaming yourself, please stop. Your fatigue is biology, not weakness. The bucket can be refilled, and the holes can be patched, but it starts with looking underneath the tiredness instead of pushing through it.
This post is drawn from Chapter 2 of my book, Where Faith Meets Medicine, where I walk through each nutrient and hormone in detail and how I help patients rebuild energy from the inside out.
