If you’ve ever lined up for a race or tackled a Sunday long run, you’ve likely seen both ends of the fueling spectrum: runners carefully sipping £3 Precision gels, and others reaching into a crumpled bag of Jelly Babies.
When you need quick energy on the move, does expensive, purpose-built sports nutrition actually outperform a packet of cheap supermarket sweets? And where do high-carb powerhouses like Science in Sport (SiS) Beta Fuel fit in?
Let’s break down the nutrition, digestion, and cost so you can decide what belongs in your running vest.
The Contenders: At a Glance
| Feature | Jelly Babies (~8 sweets) | PFH PF 30 Gel | SiS Beta Fuel Gel |
| Carbohydrates | 40g | 30g | 40g |
| Carb Ratio | High Glucose / Sucrose | 2:1 Maltodextrin to Fructose | 1:0.8 Maltodextrin to Fructose |
| Texture | Chewy candy | Smooth semi-liquid | Thicker liquid gel |
| Sodium | ~0mg | 0mg (in standard PF 30) | ~0mg (minimal) |
| Cost Per Serving | ~£0.20 | £2.50 | £2.00 |
Breakdown: How They Compare on the Road
1. The Carb Ratios & Absorption
Your gut absorbs carbohydrates using specific "transporters." Glucose uses the SGLT1 channel (capped at ~60g/hour), while fructose uses GLUT5 (~30g/hour).
Jelly Babies: Made from sucrose and glucose syrup. Because they lack a dual-carbohydrate formula optimized for absorption, pushing past 50–60g of carbs per hour via Jelly Babies often saturates your glucose transporters, leading to stomach sloshing and GI distress.
PFH (PF 30): Uses a classic 2:1 Maltodextrin to Fructose ratio. This allows you to comfortably hit 60–90g of carbs per hour by utilizing both absorption pathways simultaneously.
SiS Beta Fuel: Uses an updated 1:0.8 Maltodextrin to Fructose ratio. This higher proportion of fructose reduces stomach fullness and enhances carbohydrate oxidation, allowing endurance athletes to target a massive 80–120g of carbs per hour without gut issues.
2. Texture & Breathing Rhythms
Jelly Babies: Chewing while running at marathon or tempo pace forces you to break your breathing rhythm. They also require a lot of saliva and extra water to break down in your stomach.
SiS Beta Fuel & PFH: Gels are designed to be swallowed instantly without chewing. SiS Beta Fuel delivers a massive 40g payload in a single sachet, while Precision Fuel and Hydration have 30g, meaning fewer gel wrappers to tear open mid-stride.
3. The Price Tag
There is no denying the math: Jelly Babies win on price by a mile. For the price of a single SiS Beta Fuel or PFH gel, you can buy an entire bag of Jelly Babies.
The Verdict: When to Use What
Use Jelly Babies for: Low-intensity easy runs, training on a tight budget, or as an emergency "pocket backup" if you hit the wall.
Use PFH Gels for: Modular fueling strategies where you want consistent 30g carb increments and precise, separate control over your sodium and hydration needs.
Use SiS Beta Fuel for: Race day and high-intensity workouts—especially marathons and ultra-endurance events—where you want to maximize high-carb intake (80g+ per hour) with minimal volume and zero chewing.