Strawberry

Strawberries are the accessory fruit of Fragaria species plants, grown commercially worldwide with peak seasons in spring and early summer in temperate zones. They are consumed fresh, frozen, dried, and processed into jams, juices, yogurts, and baked goods. The fruit consists of a fleshy receptacle studded with small seeds and is notable for its bright red color and sweet-tart flavor profile.

A 150 g serving of fresh strawberries provides approximately 48 calories, 12 g carbohydrate, 3 g fiber, 1 g protein, and negligible fat. Strawberries are an excellent source of vitamin C (approximately 90–100% of the daily value per serving, depending on sex), folate, and potassium. The fruit contains substantial polyphenolic compounds—particularly ellagic acid, anthocyanins, and quercetin—which are plant secondary metabolites. These compounds are not systematically absorbed as intact molecules; gut microbiota and hepatic metabolism degrade them into smaller phenolic metabolites. The fiber and sugar content present minimal glycemic impact; strawberries have a glycemic index of approximately 40.

Polyphenol Content and Systemic Effects

Strawberry polyphenols, especially anthocyanins and ellagic acid, have been studied in vitro and in animal models for antioxidant and anti-inflammatory properties. Human dietary intervention studies show that strawberry consumption is associated with modest reductions in markers of oxidative stress and inflammatory cytokines in some populations, but effect sizes are small and heterogeneous across studies. No high-quality evidence demonstrates that strawberry consumption prevents or reverses chronic disease in humans.

Tolerance and Population Considerations

Strawberries are not among the FDA's major recognized allergens, though oral allergy syndrome can occur in individuals with birch pollen sensitivity. Fresh strawberries contain low levels of histamine. However, they are considered histamine liberators by some, meaning they can trigger the release of histamine in the body, which may cause symptoms in individuals with histamine intolerance. Therefore, individuals managing histamine intake should consume them with caution. Individuals managing oxalate intake should note that strawberries contain low-to-moderate oxalate levels (approximately 15–19 mg per 100 g by commonly referenced dietary guidance). Pesticide residues are sometimes detected on conventionally grown berries; the EPA has established safe residue limits. Fresh strawberries are perishable and are typically consumed within days of purchase; frozen strawberries retain nutritional value equivalent to fresh.