Lionel Messi on Diet and Match-Day Sickness: A Fact-Check

Messi says a poor diet heavy in chocolate and fizzy drinks made him throw up during matches, and that eating fish, meat and salads ended it. Two different claims are bundled together here. That habitual sugar-sweetened beverage intake causes weight gain and raises type 2 diabetes risk is about as well established as nutrition findings get. That those specific foods caused his match-day vomiting is far shakier: exercise-induced gastrointestinal distress is common and multi-causal, and no study isolates chocolate or soft drinks as the trigger. His diet change also coincided with a broader professional overhaul, which is exactly the confounding that makes single-athlete stories unreliable.

Lionel Messi said

“Messi says years of eating chocolate and fizzy drinks caused him to vomit during matches, and that cleaning up his diet stopped it.”

The science says

The general nutrition half is well supported, but the specific claim that sugary food caused his vomiting rests on plausible mechanism and self-report rather than on evidence that isolates it.

Science Score

Strong meta-analytic evidence on sugar-sweetened beverages and metabolic harm, weaker and mostly observational evidence linking specific pre-exercise foods to gastrointestinal symptoms in athletes, no evidence specific to this case.

The verdict

The diet change was almost certainly worth making, but the vomiting story is one athlete's account, not a demonstrated cause.

The claimWhat Lionel actually said

In a television interview Messi described a period in his twenties when he ate poorly, naming chocolate and fizzy drinks, and said it was the cause of the on-pitch vomiting that had followed him for years. He said he now eats fish, meat and salads and that everything is organised and taken care of. He was recounting his own experience rather than prescribing a plan.

Sources

Why it mattersWhy this matters for longevity

Elite athlete anecdotes get repeated as nutrition rules, and the mechanism is usually less specific than the story implies.

Gastrointestinal symptoms during hard exercise affect a large share of endurance and team-sport athletes and are frequently misattributed to one food.

The underlying advice, fewer sugary drinks and more whole food, holds up on its own evidence regardless of the vomiting claim.

The evidenceWhat the science says

Malik and colleagues, in a systematic review and meta-analysis, found sugar-sweetened beverage intake associated with weight gain in both children and adults, and Imamura and colleagues found a consistent association with incident type 2 diabetes that persisted after adjustment for adiposity. On the symptom side, de Oliveira and colleagues reviewed gastrointestinal complaints during exercise and documented high prevalence alongside nutritional strategies, including reducing high-fat, high-fibre and highly concentrated carbohydrate intake before competition, which is at least directionally consistent with what Messi describes.

What the evidence does not support is the causal attribution to chocolate and fizzy drinks specifically. Exercise-induced gastrointestinal distress is driven substantially by splanchnic blood flow redistribution, dehydration, heat and intensity, and the nutrition contribution is usually about timing, volume and concentration rather than one culprit food. Messi's change also happened alongside new professional support, different training and being several years older, none of which can be separated out. A single athlete improving after several simultaneous changes is a hypothesis, not a finding.

TakeawayThe honest takeaway

The practical lesson

Cutting habitual sugary drinks is worth doing for reasons that have nothing to do with match-day nausea, and if exercise makes you sick, look at timing, volume and hydration before blaming one food.

RelatedRelated habits

Cutting Sugary DrinksTiming Meals Before ExerciseHydration PlanningEating More Whole Foods

Each of these is a habit you can build on its own. Explore them through the Topics index.

SupplementsThe supplement angle: Electrolytes and carbohydrate drinks

Support a habit, do not replace one

Sports drinks and electrolyte products are formulated around exercise hydration, and very concentrated carbohydrate solutions can themselves worsen gastrointestinal symptoms in some people. Concentration and timing matter more than brand, and persistent vomiting during exercise is a reason to see a doctor rather than to change supplement.

Supplements can support good habits. They do not replace sleep, movement, nutrition, or medical care. Talk with your healthcare provider before starting anything new.

This is educational commentary, not medical advice, and does not imply that Lionel Messi endorses, is affiliated with, or uses Winning Longevity or any product. We critique the claim and the evidence, not the person. Any direct quote is a placeholder until sourced. Talk with a qualified healthcare provider before changing your routine. See our health disclaimer.

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