Race Week Nutrition: What to Eat in the 7 Days Before Your Triathlon
by The Next Race
Race week nutrition is mostly about not doing anything stupid.
That sounds reductive. It isn't. Most race-day nutrition disasters — the bonk at kilometre 6 of the run, the cramping on the back end of the bike, the stomach revolt in T2 — originate not from race-day decisions but from the seven days that preceded them. An athlete who nails the week before their race is already ahead of most of the field before they hit the water. For comprehensive race prep, see our guide on planning your best triathlon season.
Here's what that week actually looks like.
Days 7–5: eat normally
Seriously. This is not the week to try anything new. Not the new protein powder you saw advertised, not the carb-loading protocol you read about at 11pm on Tuesday, not the pre-race green smoothie someone in your training group swears by.
Your body doesn't need special inputs this week. It needs the food it already knows, prepared the way it's already used to. Disrupting that in the name of optimisation is how you spend Thursday night with an unhappy stomach.
If you eat pasta on Wednesdays normally, eat pasta on Wednesday. If you don't eat pasta normally, don't start now.
Days 4–3: increase carbohydrate, reduce fibre
Two to three days before the race, you begin to shift the balance of your diet toward carbohydrate and away from high-fibre foods. This isn't aggressive carb-loading — it's a moderate increase in rice, pasta, bread, and potatoes, and a reduction in raw vegetables, beans, and anything else that takes significant time to process. This aligns with the taper phase in your training—check out our Olympic triathlon training plan to see how tapering works.
The reason for reducing fibre isn't squeamishness — it's function. High-fibre foods sit in your gut longer. In race week, you want your gastrointestinal system relatively clear and calm by race morning. Athletes who eat a large salad the night before a race often find out the hard way that timing matters.
Hydration also becomes more deliberate here. Not dramatically more — just consistent. Water with meals, water between meals. If you're prone to arriving at races slightly dehydrated without realising it, now is when you fix that.
Day 2: the pre-race day
Keep carbohydrate intake high. Keep meals familiar. Avoid alcohol — it disrupts sleep and dehydrates you in ways that compound overnight.
The pre-race dinner is one of the most over-thought meals in amateur triathlon. Athletes book specific restaurants, obsess over portion sizes, and debate the virtues of different pasta shapes as though it matters. It doesn't. What matters is that you eat a meal you've eaten before, at a reasonable hour, without overeating. A heavy stomach the morning of a race is worse than a slightly lighter one.
Eat dinner two to three hours before you plan to sleep. Get to bed at a reasonable hour.
Race morning
This is where it becomes highly individual — and where testing in training pays off.
The general framework: eat something carbohydrate-heavy two to three hours before your start time. Give yourself enough time to digest. For most people this means waking earlier than feels necessary to eat breakfast before nerves kill their appetite entirely.
For a sprint or Olympic-distance race, a bowl of porridge or toast with peanut butter is sufficient. You don't need a large meal. The glycogen stores from the previous three days of increased carbohydrate are what will fuel you. Race morning breakfast is topping up the tank, not filling it from empty.
For a 70.3 or full Ironman, the calculation changes — you'll need more on the bike, and race morning intake matters more.
During the race
For a sprint triathlon: you probably don't need to eat at all. Carry a gel if it makes you feel better, but the race is short enough that your glycogen stores will carry you if you've fuelled the days before. If you're new to triathlon, read our beginner's guide to getting started.
For an Olympic: one gel, taken around 20–25 minutes into the bike leg, is enough for most athletes. Some take a second at the end of the bike. Practise this in training so you know what your body wants.
For a 70.3 and above: this becomes a whole separate discipline. Nutrition on the bike is a skill that takes as much practice as the swim, bike, or run.
The rule that overrides everything
Nothing new on race day. Not a different brand of gel that was on sale at the expo. Not a sports drink you haven't tried. Not a food offered at an aid station that you haven't tested in training.
Your gut is not adventurous under physical stress. Honour that.