Most people do best with a mixed meal 2–3 hours before class, or something small and mostly carbohydrate in the 30–60 minutes beforehand if that gap is not available. Metcons involve inversion, high breathing rates and rapid position changes, so volume and fat content in the stomach matter more than the exact macronutrient split.
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What should I eat before a CrossFit workout? Most people do best with a mixed meal 2–3 hours before class, or something small and mostly carbohydrate in the 30–60 minutes beforehand if that gap is not available. Metcons involve inversion, high breathing rates and rapid position changes, so volume and fat content in the stomach matter more than the exact macronutrient split.
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A typical class packs a warm-up, strength or skill work and a short, brutally intense metcon into an hour. The metcon is the problem for digestion: barbell cycling, burpees, handstand work, rowing and box jumps put the torso through compression, inversion and high breathing rates in quick succession, often within ten minutes of the first rep.
The other complication is class timing. A 05:30 class and a 18:00 class are completely different nutritional problems, and most advice online quietly assumes the evening one. Early-morning athletes usually settle on something very small or nothing at all, with the previous evening's meal doing the real work.
The systematic review of CrossFit and high-intensity functional training confirms that the training imposes substantial mixed aerobic and anaerobic stress, while also stating plainly that nutrition-intervention evidence in this population is limited and of low-to-moderate quality.
Because the sport-specific evidence is thin, general principles do the work. The 2026 consensus discussion on carbohydrate availability supports adequate carbohydrate for high-intensity work, and the ISSN position stand puts daily protein at roughly 1.4–2.0 g per kg of body weight for most exercising people.
CrossFit publishes its own nutrition material and Nutrition 1 resources. That is the organisation's own guidance, and we label it as such rather than presenting it as independent consensus.
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.
Options people commonly use as the 2–3 hour meal or a lighter top-up. Macros come from the menu data; the menu rotates weekly.
Examples from the SmashMeals menu and archive. The menu rotates weekly — check this week's menu.
One example shape for one class time. Adjust for your schedule and what you have found settles.
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. Pre-workout, the practical property is a meal that sits well — familiarity, portion size and fat content matter far more than whether it contains gluten.
Eat the same thing that worked last week 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.
Last reviewed .