Nutrition and CrossFit

(from the CrossFit site’s section on Nutrition)

Crossfit Nutrition — What Should I Eat?

Simple is best. This means your diet should be based on lean meats, garden vegetables (especially greens), nuts and seeds, a little starch, and no sugar. Good nutrition — That’s about as simple as it gets. Be forewarned though, that if you have special dietary requirements, these should take precedence over and above what is suggested here. Be sure to discuss these matters with both your CrossFit trainer AND your physician or dietician.

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What Food Should I Avoid?

Excessive consumption of high-glycemic carbohydrates is the primary culprit in nutritionally caused health problems. High glycemic carbohydrates are those that raise blood sugar too rapidly. They include rice, bread, candy, potato, sweets, sodas, and most processed carbohydrates. Processing can include bleaching, baking, grinding, and refining. Processing of carbohydrates greatly increases their glycemic index, a measure of their propensity to elevate blood sugar.


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What is the Problem with High-Glycemic Carbohydrates?

The problem with high-glycemic carbohydrates is that they give an inordinate insulin response. Insulin is an essential hormone for life, yet acute, chronic elevation of insulin leads to hyperinsulinism, which has been positively linked to obesity, elevated cholesterol levels, blood pressure, mood dysfunction and a Pandora’s box of disease and disability. Research “hyperinsulinism” on the Internet. There’s a gold mine of information pertinent to your health available there. The CrossFit nutrition prescription is a low-glycemic diet and consequently severely blunts the insulin response.


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Caloric Restriction and Longevity

Current research strongly supports the link between caloric restriction and an increased life expectancy. The incidence of cancers and heart disease sharply decline with a diet that is carefully limited in controlling caloric intake. “Caloric Restriction” is another fruitful area for Internet search. The CrossFit nutrition prescription is consistent with this research.
The CrossFit nutrition prescription allows a reduced caloric intake and yet still provides ample nutrition for rigorous activity.


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The Paleo Diet

CrossFit Journal: The Performance-Based Lifestyle Resource