Dietitian's Triathlon Case Highlights the Value of Fueling Practice

In an October 30, 2026 practitioner article, advanced sports dietitian Taryn Richardson described a veteran triathlete who completed the IRONMAN 70.3 World Championship in Nice without her previously recurring gut symptoms. Her account connects that outcome with changes to race fueling and everyday eating, along with a simpler approach to pre-race food.

The central message is practical: rehearse what you plan to eat and drink rather than chasing a carbohydrate target you cannot reliably tolerate. Richardson also recommends testing familiar, lower-fiber and lower-fat foods before competition.

The Reported Change

Richardson profiles Dr. Marie Stevenson, a Calgary family doctor who began running at 47. By the time described in the article, she had run 30 marathons and raced triathlon for 17 years. Yet she had experienced recurring race-day gut problems for eight years.

Her fueling history included protein bars and chews on the bike. Richardson reports that Stevenson later tried a high-carbohydrate drink with an intended intake of 80 grams per hour. On a good day, she managed about 40 grams.

Her later reported target was 65 grams per hour. In Richardson's account, this was an amount she could consistently manage.

On paper, the new target was lower than the old one. In practice, Richardson describes a more achievable intake than Stevenson had previously managed. That distinction is the heart of the story: a larger planned number and a better-executed plan are not the same thing. The useful comparison is between intention and actual consumption, not between one athlete's number and another's.

Richardson describes a broader change alongside the hourly target. Stevenson reduced pre-race fiber, practiced race-week eating and carbohydrate loading, and addressed her daily fueling.

Evidence in Context

The useful way to read this story is as a single-athlete case account, not a controlled comparison. Several parts of Stevenson's nutrition changed together, so the account cannot identify which adjustment mattered most or establish that the same approach would resolve someone else's symptoms. Her hourly figures describe her case rather than population targets. The account also provides no basis for an age-specific nutrition protocol.

Richardson draws on older research to explain her recommendations. She cites a 2017 review on gut training and summarizes potential benefits for stomach emptying and carbohydrate absorption. She also links rehearsal to a possible reduction in the likelihood or severity of exercise-related gut problems.

The October publication date belongs to Richardson's practitioner article, not to a new trial of her recommendations.

A related October 9, 2026 article on nutrition strategy from the same publisher offers additional practitioner commentary. It is not independent confirmation of Stevenson's result.

For Veteran Athletes

For endurance athletes aged 35 and older, the strongest lesson is that years of racing do not settle every nutrition question. Stevenson's experience was extensive, yet Richardson's account describes a substantial mismatch between her intended fueling and what she managed.

Reendure's focus is long-term performance as well as the next race. From that perspective, this story is an invitation to review a familiar routine rather than a reason to adopt a more aggressive target. Experience is valuable, but it is not a substitute for checking whether a plan is workable.

Start With Tolerance

Richardson's central recommendation is to work with a carbohydrate target that can be consistently tolerated and achieved. Her case directs attention to the gap between a planned intake and the amount actually consumed.

That shifts the question from How high is the target? to Does the intended plan work in practice? Richardson's advice suggests a few useful questions:

• What was planned, and what was actually consumed?
• Were the carbohydrate sources and timing familiar from training?
• Had pre-race eating been rehearsed alongside race fueling?

These questions keep food choice and timing in view alongside the amount. Simply increasing a target or replacing a product misses that broader review.

For a look at the available formats, our guide to matching fuel formats to your plan covers gels and drinks as well as chews and food.

Rehearse Before Race Week

Richardson recommends using long training sessions to practice intended race fueling. She also recommends rehearsing race-week eating and carbohydrate loading before an important competition. The rehearsal therefore concerns more than whatever goes into a bottle or pocket.

That suggests a useful distinction between familiar products and a familiar overall plan. Having used a food before is not the same question as having practiced the intended combination of foods and timing. In Richardson's approach, those details are considered before race week rather than introduced at the competition.

Reendure's guide to planning food before a demanding session or race offers a related starting point for organizing that part of preparation.

Simpler Is Specific

Richardson recommends familiar, lower-fiber and lower-fat carbohydrate foods before competition. Her recommendation concerns the period leading into a race, not a permanent change to everyday eating. She explicitly notes that fiber remains valuable for daily health.

The distinction is important: simplifying pre-race food is different from deciding that a whole category of food is unsuitable. It is also different from eating less overall. Richardson's account pairs simpler choices with carbohydrate loading and attention to daily fueling, keeping the focus on preparation rather than restriction.

For athletes whose decisions involve food sensitivities or digestive conditions, considering the wider dietary context is more relevant than copying another racer's menu. Recurring symptoms and individual dietary changes are appropriate topics for a qualified clinician or sports dietitian.

Keep the Wider View

Daily fueling was part of the change Richardson described. That detail is easy to overlook when the most memorable part of a case is an hourly carbohydrate figure. The account's practical emphasis is on the overall approach, not just the product consumed during the bike leg.

For veteran athletes, an ambitious race plan can still be a simple one. The useful objective here is a well-rehearsed strategy that fits the athlete, rather than a menu or number borrowed from someone else's successful event.

The Useful Takeaway

Richardson's article favors practice over last-minute experimentation and a workable plan over an impressive target. Its most useful contribution is to connect race fueling with pre-race food and daily nutrition rather than treating each as an isolated problem.

For athletes over 35, the clear takeaway is to give nutrition preparation the same deliberate attention as the race plan itself. Rehearse familiar choices, assess whether the planned intake is achievable, and keep any pre-race simplification separate from everyday diet quality. The goal is a plan that has earned confidence in training, not one that merely looks ambitious on paper.

Sources

1. Triathlon Nutrition Strategy: Why Information Isn't Enough
2. Triathlon Gut Issues: 3 Fuelling Changes That Fixed Them