Energy isn’t something you simply have. It’s what’s left over. Your body produces a certain amount, spends a certain amount, and hands you the difference. Feeling flat rarely means production has failed, far more often it means spending has quietly risen. The biggest spender is your nervous system, which decides, minute by minute, how much of you stays braced, alert and ready. That setting is brilliant for an hour and expensive for a year. When the spending comes down, the surplus has room to return: as a steadier baseline rather than a jolt.
When your nervous system perceives ongoing pressure, deadlines, worry, broken sleep, even old physical tension it hasn’t resolved, it leans towards a survival setting. Lived in for months, that setting leaves you wired but tired: too switched-on to rest well, too depleted to perform freely.
Where is the energy actually going?
Three places, mostly, and none of them feels like effort, which is why the drain goes unnoticed.
Your brain. Marcus Raichle and Debra Gusnard, writing in the Proceedings of the National Academy of Sciences in 2002, laid out the brain’s energy budget: about two per cent of body weight consuming around twenty per cent of resting energy, most of it intrinsic background work rather than the thinking you notice doing. A brain running sustained vigilance isn’t idling. It is working all day on a task you never consciously set it.
Your muscles. Bracing is metabolic work. Shoulders that never quite drop, a grip that tightens on the phone without being asked to, the deep muscles alongside the spine holding a guarded position: none of it burns much in any given minute, and all of it burns continuously, because nothing ever releases.
That holding has been measured directly. In 1986 Gitte Sjøgaard and colleagues had seven men hold a knee extension at just five per cent of their maximum for an hour, barely any effort at all. Pressure inside the muscle rose and stayed raised, and the muscle’s own blood supply was restricted while it worked. A contraction too small to notice was enough to interfere with the circulation feeding it.
There is also a name for why some fibres may never get a break, though it is argued about rather than settled. The proposal is that motor units are recruited smallest first and released last, so through hours of low-level holding the smallest never stand down: always working while the others rest. Researchers call them Cinderella units. Some studies have found them firing continuously; others have found them handing over to larger units, and a 2018 paper is titled “Challenging the Cinderella Hypothesis”. It is a plausible mechanism, not a settled fact.
One honest note, because this is where the argument usually overreaches. What the research measures is a cost: pressure, restricted flow, changes in the fibres themselves. The idea that this leaves less capacity for the rest of your life is a way of understanding that cost, not something the studies set out to measure.
And the most useful finding here is the one that sounds least dramatic. Gunnar Hägg’s review of muscle biopsies found the same fibre changes in workers who had no pain at all. That moves the story away from damage and towards something quieter: load accumulates long before anyone feels it.
Your chemistry. As Mayo Clinic puts it, long-term activation of the stress response and the cortisol that comes with it can disrupt almost all of the body’s processes. Bruce McEwen’s 1998 paper in the New England Journal of Medicine named that accumulating cost allostatic load. In 2018, Martin Picard and McEwen reviewed evidence in Psychosomatic Medicine that sustained stress mediators reach the mitochondria, the structures that generate your cellular energy. Their term, mitochondrial allostatic load, is a research construct rather than settled fact, but the direction matters: chronic demand doesn’t only spend your energy, it appears to reach the machinery that makes it.
Why doesn’t sleep refill the tank?
Because sleep is a process, not a duration, and a system that hasn’t stood down doesn’t run the process properly. You can be horizontal for eight hours and still spend much of it in light sleep, waking at 3am with the mind already going.
The cost of short sleep isn’t only tiredness. Karine Spiegel, Rachel Leproult and Eve Van Cauter, publishing in The Lancet in 1999, restricted healthy young men to four hours in bed for six nights and found measurable shifts in glucose handling and evening cortisol: changes the authors likened to patterns seen in much older adults, which reversed with recovery sleep. Short sleep changes how you handle fuel the next day, which is why sleep debt so often shows up as a flat patch at eleven in the morning, long before lunch has anything to answer for.
That’s the loop: poor recovery raises the next day’s spending, and higher spending makes the next night shallower. Hours in bed is the variable everyone reaches for first, and usually not the broken one. Sleep is nervous system repair, and repair needs a system that has genuinely switched off.
How do you tip the equation back in your favour?
The real question isn’t “how do I get more energy?” It’s “why is my system spending so much, and how do I help it recover?” Four things move the equation:
- Protect real recovery, not just sleep hours. A consistent, unhurried wind-down signals safety to the nervous system: same rough time, lights down, the day’s problem-solving put down rather than carried to bed.
- Eat to steady, not to spike. Regular whole-food meals keep blood sugar even. Protein and fibre early flatten the curve that otherwise has you reaching for the second coffee before midday.
- Move to discharge tension. Gentle, regular movement helps the body leave the braced setting. Spending energy can create it: in a 2008 randomised controlled trial in Psychotherapy and Psychosomatics, Timothy Puetz and colleagues at the University of Georgia found six weeks of low-intensity exercise reduced fatigue in sedentary adults with persistent tiredness: the gentler intensity outperforming the harder one.
- Notice the leaks. Chronic muscle tension, shallow breathing and a racing mind all signal a system stuck “on.” They aren’t personality traits: they’re readouts, and the cheapest information you have about where your energy goes.
Why start from vitality rather than shortage?
Vitality was never meant to be scarce. The body carries a profound, largely untapped capacity to regulate and thrive, and most frameworks for health never go looking for it: they start at the shortage, so the best they can describe is the absence of trouble. Starting from vitality asks a different question, and sets a different ceiling. A nervous system held in bracing pays for that posture all day long; ease the spending, and the ground is there for the journey the care here is aimed at: from feeling better, to performing freely, to living vibrantly. Whole, healthy and happy is not a luxury to be earned. At Diskin Life it is taken as your birthright, and everything here begins from that.
How does Diskin Life approach running on empty?
Running on empty is read at Diskin Life as feedback, the body communicating, not malfunctioning, and the response begins with a conversation rather than a scan: the free, no-obligation Discovery Session with Dr Ari, at which nothing else happens. When measurement follows, the Life Assessment brings the whole suite to the question, careful baseline testing plus seven extraordinary measures, because hidden spending shows up in more than one place. No instrument closes the equation by itself: the readings are weighed with what the person senses of their own energy, its worth in the life they value, and with Dr Ari’s interpretation, the judgment of forty-plus years and more than 25,000 people in his care. Gentle Nervous System Adjustments use light, precise contacts to cue a system that has stopped standing down, and the 13 Vitality By Design presentations carry the everyday side, Respond Better, Move Better, Eat Better, Think Better, in that sequence, so the equation keeps being worked at home.
Your nervous system decides how much of your capacity goes on holding you together before anything else gets a share, so that is where we look first. At Diskin Life the gentle Nervous System Adjustments we work with aim at the switching-off problem: helping the system find its own brake rather than forcing anything. A Life Assessment gets there by observing rather than guessing, using Clinical HRV under standardised conditions and surface EMG to read how much electrical effort goes on simply holding you upright. Neither is a diagnosis; both make direction of travel visible instead of assumed.
Premium Vitality is our name for the aim behind that work: building capacity rather than chasing symptoms. We watch it through the 4 Levels of Spiraling Health, sinking, floating, swimming, soaring, because the useful question about your energy is never today’s number. It’s which way the spiral is turning.
Which is why the aim is not to add energy from outside. It is to reduce what is being spent on holding.
What this does not tell us
Fatigue has many causes, and several have specific medical answers that Nervous System Care cannot substitute for. Iron deficiency, thyroid disorders, sleep apnoea, depression, medication side effects and infection all produce exactly the tiredness described here, and they are found with blood tests, sleep studies and your GP, not with an adjustment. If your fatigue is new, severe or comes with other symptoms, that conversation comes first.
There is also no instrument that measures “energy”. Clinical HRV and surface EMG observe aspects of regulation, not vitality itself, and no honest reading of them predicts how you’ll feel on a given Tuesday. Regulation is one input among several, sleep, food, movement, relationships and a reason to get up all write to the same account, which is why education sits alongside the hands-on work at Diskin Life rather than after it. What can be offered is a direction of travel and a way of watching it. Not a promise, and not a number.
If you read nothing else
- Energy is a balance, not a supply: what you produce minus what your system spends holding you ready.
- The main hidden costs are a brain running constant vigilance, muscles held in low-grade bracing, and the chemistry of sustained stress.
- Sleep only refills the tank when the system has genuinely switched off, hours in bed is rarely the broken variable.
- Regulation, recovery, steady food and gentle movement all work on the spending side, which is where the surplus is won or lost.
General information only, not a diagnosis or personal health advice. If persistent fatigue is significantly affecting you, please also speak with your GP.