What do studies say about Haarausfall Ernährung?

Scientific evidence on hair loss and nutrition is limited and often conflicting. It is well established that deficiencies in nutrients like iron, zinc, vitamin D, and biotin can contribute to hair loss, especially in women. However, randomized trials show that supplementation without a proven deficiency usually provides no benefit. Claims from many DNA-based diet tests relying on single SNPs (e.g., in FADS1 or VDR) are scientifically weak: effect sizes are tiny and study results inconsistent. A healthy, balanced diet with adequate protein, omega-3 fatty acids, and micronutrients is sensible, but a personalized diet based solely on a genetic test is not evidence-based. For diffuse hair loss, a doctor should first rule out deficiencies or hormonal causes.