It matters where your energy comes from

Fructose, Palatinose, and Tapioca Maltodextrin – What Really Works for 4+ Hour Efforts?

In a long race, it's not about how fast you start, but what you have left at the end. Fueling is not just about calories; it's about maintaining the balance that allows your body to function stably for hours.

When it's no longer your muscles that are tired

There's a point in every longer training session or race when your muscles are no longer the biggest challenge. It's more about whether your entire body can still cooperate with what you're giving it. The first two to three hours might seem deceptively easy from this perspective, as you have sufficient glycogen, your digestion works well, and the energy you consume is utilized almost automatically.

However, as time passes, the body begins to adapt to the load. Blood circulation increasingly shifts towards the muscles, the digestive system takes a back seat, the stomach becomes more sensitive, while energy demand remains consistently high. In this state, it's no longer about how much energy you take in, but what form it arrives in, and whether your body can truly use it.

In an ultra, it's not what you eat that matters. It's how much of it you can utilize.

Fat Adaptation – the hidden second engine

In parallel, another often underestimated process becomes increasingly important: fat utilization. During a multi-hour effort, the body cannot operate solely on carbohydrates, as glycogen stores are finite. This is when the "second engine," which is actually always within you, comes to the forefront.

Fat stores represent virtually inexhaustible energy sources, but only if your metabolism can rely on them. In this process, the quality of carbohydrate intake plays a key role, because it matters whether it supports this cooperation or disrupts it.

The goal is not to consume as many carbohydrates as possible, but for your body to be able to use fat and carbohydrates simultaneously – efficiently and stably.

Simple carbohydrates – fast energy, uncertain system

Simple carbohydrates – including glucose, fructose, and their combinations – are absorbed quickly, which might seem like an advantage in the short term. However, this speed often comes with blood sugar fluctuations and an insulin response, which brings uncertainty into the system during prolonged efforts.

Fructose deserves special attention from this perspective. It does not go directly to the muscles but is processed in the liver, which means an extra step in energy utilization. This may not necessarily be a problem under resting conditions, but it can easily become a disadvantage during prolonged efforts.

When the ingested amount exceeds the absorption capacity, the digestive system becomes strained, which can lead to bloating, cramps, and discomfort, while energy supply remains uneven.

Fast energy is often not efficient energy – especially when you need to perform for hours.

Palatinose – stable, but not always enough

Palatinose is a much more balanced solution. It is absorbed more slowly, provides more stable blood sugar levels, and does not trigger a significant insulin response, which is favorable for fat utilization.

This is what many athletes like about it: predictable, consistent energy, fewer stomach problems, calmer operation.

However, as the duration and intensity of the effort increase, it becomes increasingly apparent that this consistent energy is not always fast enough to keep up with demands. In such cases, there is no sudden drop, but a gradual "running out," which many people only notice too late.

Palatinose helps stabilize energy and supports fat utilization, but it is rarely sufficient on its own in a long race.

Tapioca-based maltodextrin – when energy actually works

Many still perceive maltodextrin as a simple sugar, but in reality, it is a complex carbohydrate that the body efficiently and predictably converts into glucose.

The tapioca-based version offers a particular advantage as it comes from a clean, easily digestible starch source. This means it puts less strain on the stomach and is well tolerated even during prolonged efforts.

In practice, this means that energy arrives directly for the muscles, not via a detour. It's not too sweet, not too intense, and most importantly: it works predictably even when you're tired.

The key to long-term performance is not fast energy, but continuously available energy.

Carbohydrates and fat burning – they work well together

One of the biggest misconceptions is that carbohydrates stop fat burning. The reality is much more nuanced.

In a well-functioning system, fat provides the basic, long-term energy, while carbohydrates supplement it where necessary. The problem is not the presence of carbohydrates, but if their type or amount upsets this balance.

Simple sugars can easily cause such a shift, while a well-chosen complex carbohydrate can support the metabolic state you need in the long term.

Fat is the foundation. Carbohydrates are the tool. Together, they provide stable performance.

When your stomach decides for you

Most races are not decided at the beginning, but hours later. When the stomach becomes more sensitive, tastes become distracting, and any overly sweet or heavy drink becomes increasingly undesirable.

This is when what you chose truly becomes important. What remains functional is what does not overload the stomach, does not cause metabolic fluctuations, and can continuously provide energy.

In the end, we always come back to the same point

A long race is not about the perfect plan, but about a functional system. About whether your body can work with what you give it.

The question is not which carbohydrate is "healthier" in general, but which best supports your body's function in the situation you are currently in.

Because ultimately, it doesn't matter how you start.

It matters if you can finish.