Keep the whole five weeks boringly consistent: adequate daily protein, adequate carbohydrate, nothing new introduced on workout day, and a rehearsed pre-workout meal you can repeat if you redo the workout. The Open's distinguishing feature is not intensity but repetition — the same decisions, five weeks running, often twice a week if you retest.
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How should I eat during the CrossFit Open? Keep the whole five weeks boringly consistent: adequate daily protein, adequate carbohydrate, nothing new introduced on workout day, and a rehearsed pre-workout meal you can repeat if you redo the workout. The Open's distinguishing feature is not intensity but repetition — the same decisions, five weeks running, often twice a week if you retest.
Make five weeks repeatable at order.smashmeals.com
The Open runs as a series of weekly workouts announced on a Thursday and submitted by the following Monday. That creates a specific rhythm: a known workout, a first attempt, a decision about whether to retest, and then a reset for the next announcement. Nutrition mistakes get repeated five times rather than once.
The second feature is anticipation. Athletes who eat normally for eleven months of the year often start experimenting during the Open — new supplements, new pre-workout routines, sudden attempts to lean out before a workout with many repetitions of a bodyweight movement. The Open is the worst time for any of that, because you are testing yourself weekly against your own previous score.
CrossFit publishes its own current guidance on eating in the run-up to the Open — Fuel for the Fittest: Dialing In Your Nutrition Before the Open — alongside its broader nutrition resources. Both are the organisation's own material. We link them because they are the current official position, and we label them as organisation guidance rather than independent consensus, and we do not repeat proprietary diet prescriptions as though they were evidence.
Independently, the systematic review of high-intensity functional training establishes the mixed aerobic and anaerobic demand while noting the limited, low-to-moderate quality of nutrition-intervention evidence in this population.
The general pillars are better supported: the ISSN position stand on daily protein (roughly 1.4–2.0 g/kg/day for most exercising people) and the 2026 consensus discussion on maintaining carbohydrate availability for high-intensity performance.
How strong is this evidence? The systematic review of high-intensity functional training is explicit that nutrition-intervention evidence in this population is limited and generally low-to-moderate quality. Treat anything specific to CrossFit as practice-informed rather than proven. CrossFit's own Open guidance is organisational advice, not a study, and this page separates the two deliberately.
Repeatable, labelled meals make five weeks of consistency realistic. Macros come straight from the menu data.
Examples from the SmashMeals menu and archive. The menu rotates weekly — check this week's menu.
One example rhythm. Adjust for when you attempt workouts and how your gym schedules them.
Our kitchen is 100% dedicated gluten-free because some people need it to be — coeliac disease, diagnosed gluten sensitivity, or a household that simply eats gluten-free. Removing gluten is not a performance strategy in itself, and there is no good evidence it improves output, recovery or inflammation in athletes without a medical reason. Through a five-week block, the value of a dedicated gluten-free kitchen for coeliac athletes is consistency: the same safe meals, week after week, with no roulette on a Friday night.
Same meals, five weeks, no surprises at order.smashmeals.com
Nutrition needs vary with body size, training volume, goals, health conditions and competition demands. For individualised performance or medical nutrition, work with a qualified sports dietitian or clinician.
Editorially reviewed by SmashMeals for source accuracy in September 2026. Written from published research and each organisation's own current format documentation. It is not medical or individualised sports-nutrition advice, and no clinician reviewed it.
SmashMeals is not affiliated with, endorsed by, or sponsored by CrossFit, LLC or any affiliate gym. CrossFit's own nutrition material is labelled as the organisation's guidance, not independent consensus.
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