Spinach: Nutrition, Health Factors and How to Eat It Well

Raw spinach provides about 194 µg folate, 483 µg vitamin K and 469 µg vitamin A activity, expressed as RAE, per 100 g in the USDA reference record. These are not cooked-serving values. [1]

Raw spinach contains about 2.7 mg iron per 100 g. Its non-haem iron is generally less readily absorbed than haem iron, and the rest of the meal affects absorption. [1] [3]

Oxalate alone is not a well-supported explanation for poor iron absorption. A small human study found that adding oxalate to a kale meal did not significantly reduce absorption. [4]

The factor cards are educational descriptions, not measurements of your hormones, inflammation or glucose. Nutrient content is useful context, but does not by itself establish clinical effects.

Dietary nitrate can contribute to nitric oxide production, which helps blood vessels relax. A seven-day trial in 27 healthy adults reported short-term blood-pressure improvements with spinach soup. [2]

The trial used soup containing 250 g spinach and about 845 mg nitrate daily. It does not establish an ordinary handful as an effective dose, or prove exercise-performance or long-term benefits. [2]

Raw spinach is not a proven requirement for nitrate benefits: the trial used soup. Choose raw or cooked spinach to suit your meals rather than chasing a prescribed nitrate response. [2]

Vitamin C helps non-haem iron absorption, but there is no fixed doubling effect for every meal. Try spinach with capsicum and citrus dressing, or fold it through a tomato-based sauce. [3] [9]

For folate retention, try steaming rather than prolonged boiling. One study found about half the folate remained after boiling, while steaming caused no significant loss under its test conditions. [5]

Vitamin C can be lost through heat and cooking water. Brief cooking with little water helps limit losses, but no method preserves everything. [9]

Steam until wilted, briefly sauté, or stir leaves into hot pasta near the end. Raw leaves also work in salads. Use a matching cooked-food record if you track nutrients by cooked weight.

Fresh or frozen spinach can suit different meals and budgets. Origin alone does not establish nutrient equivalence or freshness; storage and preparation also affect vitamin C retention. [9]

In a Functional Nutrition or Longevity Programme meal plan, spinach could feature in two or three meals a week if you enjoy it. This is an optional planning example, not a therapeutic dose or a claim about current prescribing.

If you have low ferritin, discuss the cause and treatment with your clinician. Spinach can contribute iron, but should not be relied on to correct iron deficiency. [3]

Taking warfarin? Keep vitamin K intake consistent rather than automatically avoiding spinach. Discuss major dietary changes with your anticoagulation team. Kale and silverbeet also contain vitamin K. [6]

With calcium oxalate kidney stones, ask your clinician or dietitian whether to limit spinach. Silverbeet is also high in oxalate, so it is not a suitable default substitute. [7]

IBS is not an automatic reason to exclude spinach: Monash includes it in low-FODMAP recipes. Adjust portions to your tolerance and seek dietetic help if symptoms restrict your food choices. [8]