Why a Sugar Rush Lets You Down

Anyone who has climbed a long pull out of a Lakeland valley knows the pattern. You stop for a quick fix of something sweet, feel brilliant for twenty minutes, then spend the next hour trudging with legs like wet sand. That dip is not weakness, it is chemistry. A handful of sweets or a sugary drink hits the bloodstream fast, prompts an insulin response, and the energy is gone almost as quickly as it arrived.

What you want instead is a slow, steady trickle of fuel. On a full day in the hills you might burn anywhere between 2,000 and 4,000 calories depending on distance, pack weight and how much you are sweating. Eating a decent breakfast and a big dinner is only part of the picture. The hours in between are where most people come unstuck, either by eating nothing at all or by living on flapjack and jelly babies until their stomach rebels.

The Simple Formula: Slow Carbs, a Little Protein, Some Salt

You do not need sports nutrition science or expensive branded bars. A good trail snack does three jobs at once, and once you understand them you can build your own from the supermarket.

• Slow-release carbohydrate is the main event. Oats, wholemeal bread, rye, dried fruit and nuts all break down gradually and keep blood sugar on an even keel. This is your base.
• A little protein slows digestion further and takes the edge off hunger. Cheese, peanut butter, nuts, cured meats and boiled eggs all work. You want a supporting role, not a protein-heavy meal, or you will feel sluggish and heavy.
• Salt and electrolytes matter more than most walkers admit. On a warm day or a big ascent you lose a lot through sweat, and low sodium shows up as cramp, headache and a flat, empty feeling that food alone will not fix.

A snack that ticks all three boxes is worth more than double the calories of a sugary one that only ticks the first and does it badly.

Snacks That Actually Work on the Hill

The best snack is the one you will still fancy eating on hour six, in the rain, with cold hands. Palatability matters as much as nutrition, because a bar you cannot face is a bar that stays in the bag. Here are reliable options that travel well in a rucksack.

• Oat and nut flapjack, homemade with butter, golden syrup and plenty of seeds. Dense, cheap and easy to eat with gloves on.
• Malt loaf, sliced and buttered, wrapped individually. Old-fashioned, unfashionably good, and relentlessly effective.
• Cheese and oatcakes or a chunk of mature Cheddar with wholemeal bread. Savoury food becomes precious once you have had enough sweet things.
• Trail mix with raisins, peanuts, almonds and a few salted pretzels. The salt is the point, not an afterthought.
• Boiled eggs for a shorter day, or salami and oatcakes for a longer one in cool weather.
• Dried apricots or dates stuffed with a little peanut butter, for a natural sugar hit that comes with fibre and fat rather than on its own.
• A flask of hot, weak squash with a pinch of salt on a winter round. Sounds odd, works beautifully.

Eat Before You Are Hungry

The single most useful habit in hillcraft is eating on a schedule rather than on feelings. By the time hunger arrives properly, you are already running on empty and the next hour will feel twice as hard. Aim to eat something small every 45 to 60 minutes, even if it is only a handful of nuts and a couple of oatcakes.

Pause at the top of a climb rather than the bottom. Stopping for five minutes on a summit or a col lets you eat properly with both hands free, adjust layers and check the map, all while your heart rate settles. Eating while walking is fine for flapjack and dried fruit, but anything crumbly or messy is a false economy when the wind is up.

Adjusting to Weather, Distance and Pace

Your snack bag should change with the day, not stay fixed all year. In cold weather, fat and slow carbohydrate come into their own because you burn more just staying warm, and anything frozen solid is useless. Keep bars inside a jacket pocket rather than the top of the rucksack.

In heat, appetite drops and salt losses rise. Favour lighter, saltier options, drink more than you think you need, and consider something with a bit of tartness, such as dried mango, to keep your mouth from feeling dry and stale. On a short three-hour walk you need very little, perhaps one snack and a drink. On a ten-hour epic, plan roughly 200 to 300 calories an hour and carry a spare portion in case the day runs long.

Pack It So You Will Actually Eat It

Good intentions fail in the rain. Sort your food into two bags: a front-pocket bag for the next couple of hours, and a main bag that stays buried. Put each snack in its own wrapper or small bag so you are not wrestling with a tupperware lid in a gale, and keep a few emergency items, nuts, a chocolate bar, a sachet of soup, that you do not touch unless you need them.

Finally, take the wrappers home. A tidy rucksack and a tidy hill go together, and the walker who has eaten steadily, sipped often and kept a little salt in the system will still be smiling on the final descent while everyone else is dreaming of the car park.