Walkers agonise over boots, waterproofs, and the weight of their packs, and then set off for eight hours in the hills with a single squashed sandwich and a chocolate bar. Food is the most overlooked piece of hill kit, and yet nothing affects how a long day feels more directly than how well you fuel it. The difference between finishing a walk strong and grinding to a miserable halt three miles from the car is very often not fitness or weather. It is what you ate, and when.
The trails around Brynafon reward long days out, and long days burn a serious amount of energy. A full day of walking with a pack over hilly ground can burn through several thousand calories, far more than a normal day, and your body cannot draw on that effort without something to draw from. Learning to eat well while walking is a genuine skill, and it is one that pays off immediately.
Most walkers quietly underfuel
The classic hill-day energy crash, the sudden heavy-legged, foggy-headed feeling that turns the last hours into a slog, is usually not simple tiredness. It is running low on accessible fuel. Your muscles run largely on carbohydrate stored as glycogen, and that store is limited. On a hard day you can empty it, and when you do, everything gets harder at once: your legs feel like lead, your mood sinks, your concentration fades, and even your ability to keep warm suffers.
The reason people underfuel is that hard exercise tends to blunt appetite, so you do not feel hungry even as your reserves drain. If you wait until you feel like eating, you have already left it too late, because the food then takes time to digest and reach your muscles. The skill is to eat before you need it, on a schedule, whether or not hunger prompts you.
Breakfast sets up the whole day
A good day in the hills starts at the breakfast table, ideally an hour or more before you set off. This is your chance to fill the fuel tank while you are sitting still and can digest properly, something that is much harder to do once you are working hard on the trail. A breakfast built around slow-releasing carbohydrate gives you a steady foundation to walk on.
Porridge is close to the perfect hill breakfast for a reason: it is mostly slow carbohydrate, it sits comfortably, and it releases energy gradually rather than spiking and crashing. Add something with a little fat and protein, a handful of nuts, some yoghurt, an egg, to slow digestion further and keep you satisfied. Whatever you choose, eat more than you think you need. It is far easier to top up a full tank through the day than to spend the whole walk trying to catch up on a breakfast you skipped.
Grazing beats the big lunch
The traditional approach of walking all morning, stopping for one large lunch, and walking all afternoon is one of the least effective ways to fuel a long day. A big meal diverts blood to your stomach just as you want it in your legs, leaving you sluggish for the hour after lunch, and it leaves long stretches with no fuel going in at all.
The better approach is to graze steadily, eating small amounts often rather than a lot occasionally. A few bites every half hour to hour keeps a steady trickle of fuel arriving without ever overloading your stomach or letting your reserves run dry. This is why experienced walkers seem to be forever nibbling something; they are keeping their energy on an even keel rather than riding a rollercoaster of feast and crash. Set yourself a loose rule, a mouthful of something at every short stop, and you will rarely hit the wall.
Hand in hand with this goes a mix of fuel types. Quick sugars give you an immediate lift but fade fast; slower carbohydrate and a little fat and protein provide the steady background burn. A day fuelled only on sweets is a day of sharp highs and sharper lows.
What to actually carry
Practical hill food needs to survive being crushed in a pack, be edible with cold hands, and deliver energy without much fuss. A good day’s supply usually mixes several of these:
- Slow-burning staples such as oatcakes, flapjack, malt loaf, or a dense sandwich for the steady background fuel.
- Quick sugars like dried fruit, jelly sweets, or a chocolate bar for a fast lift on a steep climb or a low moment.
- Nuts, cheese, or a little cured meat to add fat and protein that keep you satisfied for longer.
- Something warm and comforting for the summit, a flask of tea or soup, which does as much for morale as for energy.
- A deliberate emergency ration you do not touch on a normal day, so there is always something left if the walk runs long.
Aim for variety, because appetite fades on a hard day and having several options makes it more likely you will actually eat when you should.
Reading your own energy
Over time, the real skill is learning to read your own body and respond before it fails. A dip in mood, a sudden reluctance to keep going, clumsiness on easy ground, or a creeping chill are often early signs that your fuel is running low rather than signs that you are simply tired. Treat them as a prompt to stop and eat, and you will frequently find your energy and spirits recover within twenty minutes.
Pay attention to what works for you specifically, because appetite and tolerance vary. Some people can eat a substantial meal and walk on happily; others do better on constant small snacks and feel sick after anything large. Note which foods sit well when you are working hard and which turn your stomach, and build your hill diet around the ones that reliably keep you moving. Fuel the day properly and the hills feel smaller, the miles pass more easily, and the walk back to the car becomes a pleasure rather than an ordeal.