I'm a nutritionist and this is what I eat to avoid the afternoon slump
- Jo Williams
Published: July 22, 2026 at 11:07 AM
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This is how you skip the 3pm food coma...
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If you've ever found yourself staring blankly at your screen at 3pm with heavy eyelids, reaching for your fourth coffee of the day, you've met the afternoon slump. As a nutritionist, I’m often asked about energy levels and feeling tired in the afternoon. The good news is, what you eat can make a real difference to how you feel and how much energy you have later in the day.
What is the afternoon slump and why does it happen?
The afternoon slump, or ‘food coma’, is that dip in energy, focus and mood that many of us experience after lunch. Part of it is simply biology: our circadian rhythm naturally dips in the early afternoon regardless of what we eat. However, certain foods can have a big impact on your blood sugar levels, with a knock-on effect to your energy.
For example, when we eat a meal loaded with refined carbohydrates – white bread sandwiches, pasta salads or sugary snacks – our blood glucose spikes quickly, prompting a surge of insulin to bring it back down. That rapid rise and fall is like a rollercoaster, and can leave blood sugar levels lower than they were before you ate. The result is fatigue, brain fog, irritability and cravings, which can lead to you reaching for sugary pick-me-ups, triggering the same cycle all over again.
Separate from blood sugar, it’s helpful to note that large, heavy meals compound this by diverting blood flow to the digestive system, which can leave you feeling sluggish regardless of what you've eaten.
This matters beyond just an unproductive afternoon: regularly experiencing blood sugar rollercoasters is linked to poorer long-term metabolic health, and the afternoon slump itself can affect concentration, decision-making and mood, with knock-on effects for productivity and even safety, if you're driving.
It's also worth noting that diet is only one piece of the puzzle – poor sleep, dehydration, low activity levels, stress and even the room you're sitting in (too warm, too little natural light) all contribute. If you're eating well and still slumping hard every day, it's worth looking at those other factors, too, and speaking to your GP if it persists.
With that said, here are the foods I prioritise as a nutritionist to keep my energy level steadier through the afternoon.
Oats
What they are: a wholegrain, slow-release carbohydrate that's rich in a specific soluble fibre called beta-glucan.
Why prioritise them: oats digest slowly, releasing glucose into the bloodstream gradually, rather than in a rush. This helps avoid the sharp spike-and-crash pattern that fuels the slump.
Benefits: beta-glucan has also been shown to support healthy cholesterol levels, and the slow digestion helps keep you fuller for longer, reducing the temptation to snack on something sugary at 3pm.
How I eat them: a bowl of porridge at breakfast or overnight oats with natural yogurt for a mid-morning snack.
Easy ways to incorporate them: swap sugary cereal for porridge, add a spoonful of oats to smoothies or use oat flour in baking in place of white flour. Even better, combine them with a source of protein, such as a serving of yogurt or handful of nuts, to balance blood sugars further.
Oily fish
What it is: salmon, mackerel, sardines and trout are rich sources of omega-3 fatty acids, particularly EPA and DHA.
Why prioritise it: omega-3s support brain function, and have been linked to better cognitive performance and mood regulation – both of which take a hit during an energy slump.
Benefits: beyond energy, oily fish supports heart health and has anti-inflammatory properties.
How I eat it: grilled salmon with lunch or tinned sardines on toast when I'm short on time.
Easy ways to incorporate it: aim for two portions a week. Tinned options (mackerel, sardines) are cheap, need no cooking and work well mashed into salads or on crackers.
Nuts and seeds
What they are: almonds, walnuts, pumpkin seeds and more are packed with healthy fats, protein, fibre and magnesium.
Why prioritise them: the combination of protein, fat and fibre slows digestion, which helps stabilise blood sugar after a meal or when eaten as a snack. Magnesium is also involved in energy production at a cellular level.
Benefits: nuts and seeds support heart health and provide sustained energy, and the protein content helps with satiety.
How I eat them: a small handful with a piece of fruit as a mid-afternoon snack, well before the slump hits.
Easy ways to incorporate them: keep a small pot at your desk for snacking, scatter over salads or blend into a homemade energy ball.
Eggs
What they are: a complete protein source containing all nine essential amino acids, plus choline and B vitamins.
Why prioritise them: protein at lunch is one of the simplest ways to prevent a post-meal blood sugar spike, and B vitamins are directly involved in how our bodies convert food into usable energy.
Benefits: eggs are also rich in choline, which is important for brain health. They're also one of the most versatile, affordable protein sources around.
How I eat them: a boiled egg alongside lunch, or an omelette loaded with vegetables.
Easy ways to incorporate them: boil a batch of a few eggs at the start of the week for a quick and easy source of protein. Check out our egg recipes for all the inspiration.
Leafy greens
What they are: spinach, kale, rocket and similar vegetables are rich in iron, folate and fibre.
Why prioritise them: iron deficiency is a genuinely common cause of fatigue, particularly in women, and low iron can make the afternoon slump feel far worse than it needs to.
Benefits: fibre also supports steady digestion and blood sugar control, while folate supports energy metabolism.
How I eat them: stirred through a lunchtime stir-fry, or as the base of a hearty salad with protein on top.
Easy ways to incorporate them: add a handful to smoothies, soups, pasta sauces or sandwiches for an easy, low-effort way to boost intake.
Greek yogurt
What it is: a strained yogurt that's higher in protein and lower in sugar than standard yogurt.
Why prioritise it: the protein content helps slow the release of any accompanying carbohydrates into the bloodstream, and it's a satisfying, filling snack.
Benefits: it also supports gut health thanks to live cultures, which is increasingly linked to mood and energy regulation via the gut-brain axis.
How I eat it: with berries and a scattering of seeds as an afternoon snack, timed just before the slump would normally hit.
Easy ways to incorporate it: use it instead of regular yogurt or cream in recipes, or as a base for savoury dips. Try adding a dollop on top of chickpea fritters with a fresh cucumber salad.
The takeaway
None of these foods are a magic fix on their own, but building lunch around slow-release carbohydrates paired with protein and healthy fats, a source of fibre and enough iron and omega-3 can genuinely smooth out the peaks and troughs that drive the 3pm slump. Pair this with good sleep, regular movement and staying hydrated, and you've got a far better shot at sailing through the afternoon without needing that fourth coffee or chocolate bar.
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Jo Williams
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