SGLT1 Limit
Glucose and maltodextrin use the SGLT1 transporter, which saturates around ~60 g/hr for most athletes.
Plan carbs, sodium, fluid, bottles, and ingredient quantities for race day or long training sessions.
BrowseAUTO or FIXED and DRINK or OTHER.Duration calculator: estimate workout duration from pace/speed and distance or pull a planned workout from Intervals.icuCarb Calculator: select sport-specific carb-rate and glucose:fructose ratio presets and apply both targets together.Sweat Loss Calculator: estimates sodium loss/replacement and can apply sodium target.Segmented mode: create multi-segment plans with different targets and ingredients. Think between aid stations in an ultra or classic swim, bike, run.Quick Log: fast ingredient logging workflow (Ingredients -> Outputs -> Log) without full planning. I typically use this if I go for a 90m run and bring a couple of gels. I dont need the full planning feature but still want to log this data to intervals.icu.AI button in Recipe builds a prompt to paste into your favorite AI for feedback on your nutrition plan.duration x carbs/hr target.duration x sodium/hr target.500-1000 mL/hr.8.0% W/V.400-1100 mg/L.270 or above 330 mOsm/L. Above 450 mOsm/L is high GI risk unless diluted.Note: These flags are only for reference based on general guidelines and used to fine-tune your planning. Ultimately you do you — personally most of my nutrition plans show multiple flags.
Carbs/hr: total carbs divided by duration.Sodium/hr: total sodium divided by duration.Ratio: glucose:fructose ratio from scoped totals.Total fluid/hr: total fluid divided by duration.Bottles/hr: bottle count divided by duration (informational).Carbs: total carb grams from all ingredients.Drink: carbs from ingredients with delivery = Drink.Other: carbs from non-drink items (Drink + Other = total carbs).Glucose, Fructose, Glucose:Fructose: total sugar split and ratio.Protein, Fats, Calories: macro totals and kcal (4/4/9 rule).Caffeine (mg): total caffeine.Caffeine (mg/kg): caffeine dose by body weight (set using the gear button).Sodium, Potassium, Magnesium: electrolyte totals.Total fluid (mL): planned fluid from water inputs.Drink mix fluid (mL): water assigned to mix bottles.Water-only bottle fluid (mL): water carried in bottles marked as water-only.Chase water (mL): explicit chase-water entries (for example aid-station cups).Estimated sweat loss (mL): sweat model output from targets.Net water loss (% body weight): hydration deficit by body mass (set using the gear button).Volume (cm^3): ingredient volume only (excludes added water).Cost ($): total ingredient cost.Carb concentration (% W/V): drink carbs per 100 mL of drink solution.Sodium concentration (mg/L): drink sodium per liter of drink solution.Total dissolved solids (g/L): drink solids concentration.Osmolarity (mOsm/L): drink osmolarity concentration.Glucose:Fructose ratio is unchanged by time normalization.Drink mix fluid and Chase water are shown per bottle.Total fluid/hr.SGLT1 for glucose/maltodextrin and GLUT5 for fructose.90 g/hr), ratio flexibility is higher and close blends such as 1:0.8 can still work.100-120 g/hr for running and 120-180 g/hr for cycling), ratio precision becomes more important for exogenous carb oxidation and GI tolerance.120 g/hr while bike includes 150 (advanced) and 180 (experimental) tiers intended for individual gut-trained use.