RACE NUTRITION DIAGNOSTIC

Find out why your race nutrition failed.

Tell us what went wrong and what you consumed. We will reason backwards through your physiology to identify the likely root cause — and tell you exactly what to refine for next time.

What went wrong?

Tell us what you experienced. Different symptoms point to different root causes — and the diagnostic is tailored to each.

Primary Symptom Pick the most significant issue. If the session went well and you want to debrief what worked, choose the last option.

When did it start? Timing is one of the clearest signals. Early-onset issues usually point to pre-race or pacing; late-onset issues usually point to cumulative deficit.

Severity How much did it affect your performance? This calibrates how aggressive our refinement recommendations should be.

Session Details

Tell us about the session you're debriefing. These details anchor everything that follows — we use them to calculate what you should have consumed.

Session Name optional Give it a name like "Busso 70.3" or "Long ride with Bailey" so you can reference this diagnostic later.

Session Type Race-day execution typically calls for higher carbohydrate and tighter sodium management than training.

Sport Different sports have different metabolic demands and practical fuelling constraints.

Duration Total session duration drives expected fluid, sodium and carbohydrate need.

2h 00m

30m2hr4hr8hr17hr

Effort Level Higher intensity increases carbohydrate oxidation and metabolic heat production, raising both fuel and fluid demands.

Air Temperature The primary environmental driver of sweat rate.

Cool <15°

Warm 15–25°

Hot 25–35°

Extreme >35°

Humidity High humidity reduces sweat evaporation, so your body sweats more to achieve the same cooling.

Your Physiology

If you've used the Hydration Intelligence System before, these will pre-fill. The diagnostic uses these to estimate what your body needed during the session.

Body Weight Used to scale sweat volume estimates to your body mass.

Training Level More experienced athletes often produce higher sweat volumes and tolerate higher carb intake.

Gut Sensitivity Determines your upper carbohydrate and concentration ceiling.

Heat Acclimation Status True heat acclimation requires sustained, repeated heat exposure that raises core temperature — not just living somewhere warm or having trained outdoors recently. Be honest with yourself: under-claiming is safer than over-claiming for diagnostic accuracy, because acclimated athletes lose less sodium per litre of sweat and need less replacement.

Sweat Profile How much you sweat. Determines fluid replacement need.

Sodium Loss Profile Sweat sodium concentration varies up to 4× between athletes.

Entering your sweat test data overrides the presets above and significantly improves diagnostic accuracy.

Measured Sweat Rate

L / hr

Sweat Sodium Concentration

mg / L

What did you consume?

Reconstruct your hourly intake as accurately as you can remember. If you're not sure on a value, choose "I don't know" — the diagnostic handles missing data honestly rather than guessing.

Fluid Intake Approximately how much liquid did you consume per hour? Bottles, hydration packs, aid stations — all combined.

Sodium Intake from Drinks Pick the drink you used — we'll auto-fill typical hourly sodium delivery. If you used plain water, select that.

Lytework Capsules Taken optional If you took Lytework capsules during the session, enter the total count. Leave blank if none.

capsules total

Carbohydrate Intake Approximately how many grams of carbohydrate per hour from gels, bars, drinks, real food — all combined.

Pre-Race Context

Optional details that sharpen the diagnosis. The pre-race window shapes what happens during the session.

Pre-Race Fluid & Sodium Loading optional Did you pre-load fluids and sodium in the 60–90 minutes before the start?

Pre-Session Sleep optional Poor sleep affects hydration status, perceived exertion, and tolerance to GI stress.

Anything else worth flagging? optional Pacing, mechanical issues, weather changes, illness, recent training load — anything you think contributed.

Your Diagnosis

A structured analysis of what likely happened and what to refine for next time.

Your diagnosis is ready — enter your email to unlock.

We'll send the full diagnostic report to your inbox, including likely root cause, contributing factors, and a refined strategy for next time.

Root cause analysis based on your physiology and intake
Calculated gaps between need and consumption
Refinement recommendations for your next race
Direct handoff to refined Hydration Intelligence System strategy

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LIKELY ROOT CAUSE

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Gap Analysis

What your physiology suggests you needed versus what you actually consumed:

Contributing Factors

What To Refine Next Time

NEXT STEP

Build a refined strategy

Use these findings to build a refined hydration and fuelling plan for your next race or training block. Your inputs will pre-fill where possible.

BUILD REFINED STRATEGY

IMPORTANT

This is educational analysis based on your reported inputs and population-level physiological models — not medical diagnosis. Symptoms that persist, worsen, or include dizziness, confusion, fainting, or severe pain should be evaluated by a sports physician. Severe or recurring cramping, GI distress, or energy collapse may also reflect non-nutritional factors including pacing, training adequacy, conditions, or underlying medical issues.

DIAGNOSTIC PROGRESS

Updates as you fill the form

Symptom

Session

Physiology

Intake

Context

Order Special Instructions

Subtotal