Three o’clock on a Tuesday and I’m staring at my notebook, pen in hand, absolutely nothing happening. The morning swim at Terrigal had been good — glassy water, a bit cold still — and I’d eaten a solid breakfast. So why did I feel like I’d been gently unplugged?
I’ve written about this in my journal more times than I can count. Not the dramatic crash-on-the-couch kind of fatigue, but that slow, blurry deflation that arrives mid-afternoon and makes everything feel slightly harder than it should. The thing I keep coming back to is that most energy slumps aren’t random. They’re trying to tell you something, and once you start reading them, the patterns are actually pretty clear.
Not all slumps are the same
I’ve noticed there are roughly three kinds of slumps that show up regularly in my own days, and they feel different from each other once you learn to distinguish them.
The first is the sharp mid-morning drop, usually around 10 or 10:30am. The second is the classic post-lunch fade, that familiar heaviness after midday. And the third is the late-afternoon wall — around 3 to 4pm — which I used to treat as an invitation to reach for something sweet or a second coffee.
Each one has a different texture. The mid-morning drop often arrives when I’ve either skipped breakfast or eaten something that wasn’t particularly sustaining — mostly refined carbohydrates, nothing with much staying power. The post-lunch fade tends to be heavier, almost sedative, and it’s often connected to the volume and composition of what I’ve eaten. A big, starchy lunch leaves me foggy in a way that a protein-and-vegetable-forward lunch rarely does. The late-afternoon wall, honestly, I think is underrated as a signal. That’s when I notice I’m also thirsty, or that I haven’t moved in two hours, or that I’ve been mildly anxious about something and burned through more energy than I realised.
Blood sugar is only part of the story
The easy explanation for energy slumps is blood sugar — eat something high in refined carbs, get a quick lift, then a drop. That’s real, and Eat for Health’s guidance on carbohydrates and the glycaemic index explains the mechanism clearly if you want the detail. But I’d argue it’s a bit reductive to stop there. In my experience, the slumps that really flatten me aren’t always tied to a sugary snack. Sometimes they’re about hydration. Sometimes they’re about sleep the night before. Often they’re about stress — that low-grade, background hum of a full to-do list that slowly drains the tank without you noticing.
Dietitians often suggest thinking about energy as something you’re managing across the whole day rather than fixing in the moment, and that framing has stuck with me. It shifts the question from ‘what do I eat right now to feel better?’ to ‘what did I do across the last twelve hours that led me here?’
What your food choices earlier in the day are doing now
This is the part that took me a while to genuinely believe, but I’ve noticed it enough times now that I trust it. What you eat for breakfast and lunch has a real influence on how you feel at 3pm. Not in a strict, rule-based way, but in a general, cumulative way.
Mornings when I’ve had something with a bit of protein — eggs, or a good handful of legumes through a grain bowl, or even leftover miso-glazed salmon with greens from the night before — I tend to have a longer, more even stretch of focus through the morning. Mornings when I’ve grabbed something highly processed and eaten it in the car, not so much.
Lunch is similar. I’ve been experimenting lately with building meals around vegetables first, then protein, then some complex carbohydrates rather than the other way around. Something like a chickpea and roast capsicum salad, or a simple bowl with whatever’s in the fridge. The post-lunch fog is noticeably lighter. I’m not making any grand claims here — it’s just what I’ve observed in my own days, which is admittedly a sample size of one.
The gut connection that’s easy to overlook
I’ve spent a fair bit of time thinking about gut health lately, partly because it kept coming up in what I was reading, and partly because I noticed a correlation between days when my digestion felt sluggish and days when my energy felt low. Whether that’s cause or effect or just coincidence, I genuinely don’t know. But gut health and how you feel is a relationship worth paying attention to.
The short version, as best I understand it from sources like Healthdirect’s gut health overview, is that the gut and brain are in constant communication, and the state of one tends to influence the state of the other. A gut that’s well-fed — with fibre, a variety of plant foods, fermented things where tolerated — seems to support steadier energy and a calmer nervous system generally. Our own piece on small gut health habits that actually fit real life goes into this more practically if you’re interested.
What I’ve changed on this front: more variety in my vegetables across the week, regular legumes, and something fermented most days — usually yoghurt, occasionally kimchi. None of it is dramatic. That’s sort of the point.
Sleep debt shows up in your afternoon more than your morning
Here’s the thing I find most useful about energy slumps: they’re often delayed signals. A bad night’s sleep doesn’t just make you tired the next morning — it makes you significantly more vulnerable to that 3pm wall. I’ve noticed this pattern in my own weeks more clearly than almost anything else.
When I’ve had four or five nights of genuinely good sleep — in bed before ten, not looking at my phone until nearly midnight — my afternoons are categorically different. Calmer, more even, less desperate for a coffee or something sweet. When the sleep has been patchy, everything downstream suffers. Our piece on sleep and weight loss touches on some of the physiology, and while the context is different, a lot of the underlying mechanisms apply here too.
I’ll admit I got this wrong for years. I used to treat tiredness as a present-moment problem to be solved with caffeine or sugar, rather than a signal about something that had already happened. The slump is the report card, not the problem itself.
Simple shifts that have actually helped me
I’m careful not to turn any of this into a rigid protocol, because in my experience rigidity is its own kind of stress. But a few things have genuinely and consistently made a difference.
Moving at lunchtime, even a short walk along the beachfront near where I work, seems to reset something. Eating breakfast that includes protein rather than leaning entirely on toast or fruit. Keeping water actually in front of me rather than across the room, because I will not get up and drink it otherwise. And — this feels almost embarrassingly simple — not scheduling my hardest cognitive work for late afternoon. I do the thinking-heavy stuff in the morning when my energy is most reliable and leave the afternoon for things that need less from me.
On the food side, having something small and sustaining around 3pm rather than waiting until I’m flat-out depleted seems to help. Not a biscuit or something sweet, but something with a bit of substance — a small bowl of roasted chickpeas, or a couple of dark chocolate and tahini bliss balls. The goal is to meet the slump before it arrives, rather than negotiating with it once you’re already in it.
One piece I keep returning to when thinking about the evening side of this is foods that support a calmer evening — because how you wind down directly shapes how you feel the next afternoon. It’s all one long conversation, really.
The slumps will still come sometimes. But they’re much less mysterious once you start reading them as information rather than just inconvenience.
— Tanya Pryce, Golden Door Living
