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Only single sugars cross. The carriers in the intestinal lining move one monosaccharide at a time: SGLT1 carries glucose (and galactose), GLUT5 carries fructose. Pairs and chains are not transported until they are cut. Wright, Loo and Hirayama, Physiological Reviews 2011
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Who does the cutting. Pancreatic amylase breaks starch and maltodextrin into short pieces in the small intestine; the enzymes on the gut wall itself, maltase-glucoamylase and sucrase-isomaltase, finish them to glucose, and sucrase-isomaltase splits table sugar into glucose and fructose. Each cut uses one water molecule. standard digestive physiology
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Maltodextrin is fast too. Glucose and maltodextrin are used at the same rate during exercise, and the cutting step is not what limits how much carbohydrate you can use per hour; the carriers are. Jeukendrup, Sports Medicine 2014
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Honey against dextrose in a trial. In a simulated 64 km cycling time trial a honey gel and a dextrose gel both beat placebo, with no difference between the two. Nothing on this page claims honey is faster. Earnest et al., Journal of Strength and Conditioning Research 2004
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What is in honey. Averages for American honeys: fructose about 38%, glucose about 31%, water about 17%, maltose about 7%, sucrose about 1%. About 85% of honey’s sugar is already single by weight; the rest is still cut by your own enzymes. White et al., USDA Technical Bulletin 1261, 1962; USDA FoodData Central
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The bee’s enzyme. Honey bees add invertase from their hypopharyngeal glands to nectar as they carry and store it; it cuts nectar’s sucrose into glucose and fructose while the colony fans the nectar down to about 17% water. Nectar is mostly sucrose, and its mix varies by flower. bee physiology, standard references
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Parity, not superiority. Several engineered gels list glucose and fructose directly and reach the gut wall the same way honey does. Honey gets there from one ingredient. As effort rises, blood shifts from the gut toward working muscle; we treat that as a reason to prefer fewer digestive steps, not as a measured performance difference. ter Steege and Kolkman, Alimentary Pharmacology and Therapeutics 2012
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What raw means here. The honey we buy is raw. The finished gel is heated briefly at fill under a process authority letter (2025) that classifies it as a shelf-stable acid food. Heating reduces honey’s own enzyme activity, so we make no live-enzyme claim. Hydrolysis is not reversed by heat: the sugars stay cut. process authority letter, Deibel Labs 2025
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What the 60 and 90 figures are. About 60 g/hour (glucose alone) and about 90 g/hour (glucose plus fructose) are peak rates at which the body burns swallowed carbohydrate in tracer studies; absorption at the gut wall is thought to be the limit. They are capacities, not targets. Jeukendrup, Current Opinion in Clinical Nutrition and Metabolic Care 2010; Sports Medicine 2014
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The two doors. SGLT1 sits on the gut-facing side of the intestinal cell and moves glucose with two sodium ions per sugar; GLUT5 moves fructose with no sodium. Both sugars leave the cell on the blood side through a third transporter, GLUT2. Wright, Loo and Hirayama 2011
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Ratios. Current engineered blends target about 0.8 g fructose per 1 g glucose. Honey is about 1.2 fructose per 1 glucose, slightly fructose-heavy, inside the two-door idea rather than the engineered optimum. Some athletes tolerate fructose-heavy fuel less well at high hourly intakes. Rowlands et al., Sports Medicine 2015; O’Brien and Rowlands 2011
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Fructose’s route. Absorbed fructose travels first to the liver, which converts most of it to glucose and lactate before release into the blood, so it reaches working muscle a little after the glucose. Tappy and Lê, Physiological Reviews 2010; Gonzalez et al. 2017
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Every modern dual-carbohydrate gel uses both doors. BON is not claiming different biology; it gets both sugars from one ingredient. Gut tolerance to high intakes is individual and improves with practice: fuel in training the way you plan to fuel on race day. Pouch counts are in the FAQ; the pack says as needed.
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Two sodium per glucose. SGLT1 binds two sodium ions first, which raises its affinity for glucose, then carries all three across in one cycle. Wright, Loo and Hirayama 2011
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Water. In the original cell studies a couple of hundred water molecules (about 260) moved with each glucose through SGLT1; how tightly they are coupled is still debated. The amount of water that follows in a real gut depends on what is dissolved around it. Loo et al., PNAS 1996; later debate
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Oral rehydration. Pairing glucose with sodium so that water follows is the principle behind oral rehydration solutions. This gel is fuel, not a rehydration drink: take it with water. WHO oral rehydration guidance
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The pump. The Na+/K+-ATPase sits on the blood-facing membrane of every cell, gut cells included. It uses one ATP to move three sodium out and two potassium in, keeping sodium low and potassium high inside the cell. The potassium it uses comes from the blood side, not from the gut contents. Skou 1957 for the enzyme; Post and Jolly 1957 and Garrahan and Glynn 1967 for the 3 : 2 : 1 cycle
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Your gut supplies sodium of its own. The small intestine receives litres of sodium-rich secretions a day, so the fluid at the door is already close to blood in sodium, and sodium-free glucose drinks absorb glucose fine in studies. One pouch’s glucose rides through the door with about 1.6 g of sodium that is pumped straight back to the blood; the pouch brings about 0.22 g of it, the gut lends the rest. intestinal physiology, standard references
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Sweat. Sodium runs roughly 10 to 90 mmol/L between people (about 0.2 to 2 g per litre, about 1 g typical); potassium about 4 to 8 mmol/L (about 160 to 310 mg per litre). A sweat test is the only way to know yours. One pouch’s 220 mg of sodium is about the sodium in a cup of average sweat: a top-up. Baker, Sports Medicine 2017; Baker, Temperature 2019
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Why the diagram says sodium, not salt. Table salt is sodium chloride, and pink Himalayan salt is about 97 to 98% sodium chloride; its trace minerals do nothing at the door. The transporter uses the sodium ion; chloride crosses alongside and counts toward the water pull. The pouch’s 0.5 g of salt is about 197 mg of sodium. Potassium per pouch is the label value.
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Chia mucilage. A soluble polysaccharide built mainly from xylose, glucose and glucuronic acid, held in the outer cells of the seed coat. It swells on contact with water; whole seed takes up roughly 10 to 12 times its weight. Lin et al. 1994; Capitani et al., Journal of Food Engineering 2015; Timilsena et al., Carbohydrate Polymers 2016
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Honey’s water. Honey is about 17% water by weight; the Codex honey standard caps moisture at 20%. The only water in the pouch is honey’s, about 3.4 g in 20 g. Honey has no yield stress: nothing holds it in place until it is pushed, so it strings and drips. USDA FoodData Central; Codex Alimentarius
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How much chia. Chia seed is about 34% fiber by weight, so 1 g carries about 0.34 g; the seed is roughly 5 to 6% mucilage, so one pouch carries about 0.05 g. USDA FoodData Central
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Dose. Viscous soluble fibers slow stomach emptying and flatten the rise in blood glucose after a meal. Chia has shown this in people at 7 to 25 g per serving; whole and ground seed acted alike. One pouch has 1 g: 7 to 25 times less chia, and 2.5 to 9 times less per gram of carbohydrate. We don’t claim a change in how the sugar gets in at this dose. Vuksan et al. 2010; Ho et al. 2013; Vuksan et al. 2017
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Thickeners. Most gels use a thickener (pectin, xanthan, gellan or alginate); chia mucilage is a hydrocolloid from a seed doing the same job. None of them is fuel, and at the amounts used in gels the choice of thickener does not change how the sugars are absorbed.