HAMMER GEL VS OTHER ENERGY GELS: THE UK ENDURANCE ATHLETE'S GUIDE TO FUELLING & METABOLIC HEALTH

Introduction

Most endurance athletes spend hours researching training plans, shoes and race strategy — but spend less than 30 seconds choosing their energy gel.

 

Yet the gel you reach for in every training session and race is a cumulative nutritional decision made hundreds of times per year. Understanding what's actually in your gel, and what it does to your body over time, is one of the most practical steps you can take for both performance and long-term health.

 

This guide explains the key ingredients found in energy gels, how to read a label, and why the type of carbohydrate matters — not just on race day, but across a full season of training

 

How to Read an Energy Gel Ingredient Label

The ingredients list on any food product in the UK is listed in descending order by weight — so whatever appears first is present in the largest quantity. For energy gels, the first one or two ingredients tell you almost everything you need to know about the product's nutritional philosophy.

What to look for:

• The first ingredient(s) reveal the primary carbohydrate source
• Look for added sugars listed separately in the nutrition panel
• Check for artificial colours (e.g. E102, E110), flavours and sweeteners
• Note whether amino acids, electrolytes or other functional ingredients are included

Simple Sugars: What They Are and Where They Hide

Simple sugars are rapidly absorbed carbohydrates that cause a quick rise in blood glucose. They are cheap to produce, intensely sweet, and provide fast energy — which is why they're common in mainstream energy gels. Here's what to look for on the label:

 

Glucose (also called Dextrose) The body's primary fuel source. Absorbed directly into the bloodstream, causing a rapid rise in blood glucose and a corresponding insulin response. Fast energy, but also a fast crash if not matched to exercise intensity.

 

Fructose A simple sugar found naturally in fruit, but also widely used in processed sports nutrition. Unlike glucose, fructose is metabolised almost entirely in the liver rather than being used directly by muscles. In moderate amounts this is manageable, but high and repeated fructose intake from processed sources has been associated in research with increased hepatic (liver) fat synthesis and metabolic stress. On a label, look for: fructose, high-fructose corn syrup, fruit syrup, agave syrup.

 

Sucrose (Table Sugar) Sucrose is a disaccharide — one molecule of glucose bonded to one molecule of fructose. When digested, it splits into equal parts glucose and fructose. Many mainstream gels use sucrose as a primary ingredient because it's inexpensive and provides rapid energy. On a label, look for: sucrose, sugar, cane sugar, cane syrup.

 

Glucose Syrup / Corn Syrup Processed glucose in liquid form. Functionally similar to glucose — fast-absorbing, high glycaemic index, rapid insulin response.

 

Label reading tip: If you see two or more of these simple sugars in the first three ingredients of a gel, you're looking at a high-sugar product designed for rapid carbohydrate delivery. This may be appropriate for short, high-intensity events — but consider the cumulative effect if you're using these products across multiple training sessions every week.

Maltodextrin: The Complex Carbohydrate Alternative

Maltodextrin is a polysaccharide — a chain of glucose molecules derived from starch (typically corn, wheat or potato). Despite being technically classified as a complex carbohydrate, it has a relatively high glycaemic index, but its multi-chain structure means it digests slightly more gradually than simple sugars and is gentler on the gut.

Crucially, maltodextrin:

• Contains no fructose — so it doesn't place the same metabolic load on the liver
• Produces a smoother glucose curve than sucrose or glucose syrup
• Is less sweet than simple sugars — reducing flavour fatigue on long efforts
• Is easier to digest for most athletes during prolonged exercise

On a label, look for: maltodextrin, glucose polymers.

Hammer Gel's primary carbohydrate source is maltodextrin — which is why it sits at the top of the ingredient list and why the product behaves differently in the body compared to simple sugar-based gels.

 

Simple Sugars vs Maltodextrin: Side by Side

	Simple Sugars	Maltodextrin (Complex Carb)
Absorption speed	Very fast	Moderate
Blood glucose spike	Sharp	Smoother
Insulin response	Rapid, high	More gradual
Liver metabolic load	High (fructose)	Low (no fructose)
Sweetness	High	Mild
Flavour fatigue risk	Higher on long efforts	Lower
GI comfort	Variable	Generally high
Long-term metabolic load	Higher with frequent use	Lower

Why This Matters for Long-Term Metabolic Health

For athletes training 4–8 hours per week across a full year, the cumulative effect of fuelling choices adds up significantly. Consider:

• A runner training 5 days per week and using 2 gels per session consumes ~500 gels per year
• If each gel contains significant fructose and simple sugars, that's a substantial repeated metabolic load on the liver and insulin system — outside of what whole food sources would typically deliver
• Over months and years, habitual blood glucose variability has been linked in research to increased oxidative stress and inflammation — both counterproductive to endurance adaptation and recovery

This doesn't mean simple sugar gels are harmful in isolation. In the context of intense exercise, the body handles them well. But for athletes fuelling frequently across a long training year — particularly masters athletes where insulin sensitivity naturally declines with age — the type of carbohydrate matters beyond just race-day performance.

 

Hammer Nutrition's philosophy has always been: supply the calories the body can effectively use, from sources that support both performance and long-term health. That's why Hammer Gel has remained built around maltodextrin and amino acids for over 39 years, rather than chasing the high-carb marketing trend.

 

Added Amino Acids: What They Do

Hammer Gel includes amino acids alongside its carbohydrate formula — something rarely found in mainstream energy gels. During prolonged endurance exercise, the body begins to draw on amino acids for energy as glycogen stores deplete. Including them in your gel helps support endurance during extended activity and contributes to a more complete fuelling profile beyond simple calorie delivery.

 

The Practical Label-Reading Checklist

Next time you pick up an energy gel, flip it over and ask:

•  What's the first ingredient? Maltodextrin = complex carb. Glucose/sucrose/fructose = simple sugar.
•  Is fructose listed? If yes, and it's high on the list, expect a higher liver metabolic load with frequent use.
•  How sweet does it taste? High sweetness = high simple sugar content. Flavour fatigue is real on 4+ hour efforts.
•  Are there amino acids? Most mainstream gels don't include them.
•  Are there artificial colours or sweeteners? Check the E-numbers.
•  Is there a jug or bulk format? Single-serve only products cost significantly more per serving for regular training.

Conclusion

Your energy gel is not just a race-day tool — it's a nutritional decision you make hundreds of times per year. Understanding what's in your gel, and what it does to your body over time, puts you in control of both your performance and your long-term metabolic health.

Hammer Gel is built on maltodextrin, amino acids and clean ingredients — a formula designed not just to get you to the finish line today, but to support your health across a lifetime of endurance sport.

 

Shop Hammer Gel UK →

 

FAQ

What is maltodextrin and is it safe? Maltodextrin is a complex carbohydrate derived from starch, widely used in sports nutrition. It digests more gradually than simple sugars, contains no fructose, and is generally well tolerated during endurance exercise. It is considered safe and is approved for use in food products in the UK and EU.

 

Why do some energy gels use fructose? Fructose is used in many gels because it is absorbed via a different intestinal transporter to glucose, theoretically allowing higher total carbohydrate absorption rates. However, fructose is metabolised in the liver rather than directly by muscles, and high repeated intake has been associated with increased metabolic load. Hammer Gel avoids added fructose entirely.

 

How can I tell if my energy gel is high in simple sugars? Check the ingredients list — it's ordered by weight. If glucose, sucrose, fructose or corn syrup appear in the first two or three ingredients, the product is primarily simple sugar-based. Maltodextrin or glucose polymers near the top indicate a more complex carbohydrate formula.

 

Are energy gels bad for your teeth? Simple sugar gels are acidic and can contribute to dental erosion with frequent use. Rinsing with water after gel consumption is recommended. Maltodextrin-based gels are generally less acidic and less sweet, reducing — though not eliminating — this risk.

 

"This article is for informational and educational purposes only and does not constitute medical or nutritional advice. If you have a medical condition affecting blood glucose regulation or metabolism, consult a qualified healthcare professional before making changes to your nutrition strategy."