Brittle hair is characterized by hair fibers that break easily, split, lose elasticity, appear dull, or become rough due to weakened structural integrity within the hair shaft. Hair quality is influenced by keratin protein synthesis, amino acid availability, mineral balance, oxidative stress regulation, circulation to the follicle, hydration status, and scalp inflammatory activity. The hair shaft is composed primarily of keratin proteins strengthened by sulfur-containing amino acids, trace minerals, antioxidant defense systems, and cellular repair pathways within follicular tissue. Oxidative stress, chronic inflammation, nutrient insufficiency, restrictive eating patterns, environmental pollutants, ultraviolet exposure, dehydration, metabolic stress, and chronic endocrine imbalance may impair normal keratinocyte activity and weaken hair structure. Hair follicles are metabolically active tissues that require continuous nutrient delivery for proper growth cycles and structural maintenance. Inadequate intake of protein-containing plant foods, iron-rich legumes, zinc-containing seeds, copper-containing nuts, and antioxidant-rich fruits and vegetables may reduce support for healthy follicular activity and hair shaft resilience. Plant foods naturally contain polyphenols, carotenoids, flavonoids, sulfur compounds, vitamin C compounds, vitamin E compounds, folate-related nutrients, and trace minerals involved in collagen biosynthesis, antioxidant defense, circulation support, and keratin production pathways. Oxidative damage to follicular cells may weaken cuticle integrity while inflammatory signaling pathways may disrupt the normal anagen growth phase of hair follicles. Reduced antioxidant protection may also increase structural damage from ultraviolet exposure and environmental stressors. A whole food plant-based dietary pattern emphasizing legumes, leafy greens, seeds, colorful vegetables, berries, citrus fruits, nuts, mushrooms, and mineral-rich whole foods may help support normal hair follicle metabolism, hydration balance, connective tissue integrity, and antioxidant protection systems. Foods rich in iron, zinc, copper, selenium, vitamin C, vitamin E, carotenoids, and sulfur-containing compounds may help support keratin synthesis pathways and collagen-related scalp tissue support. Pumpkin seeds, lentils, chickpeas, spinach, kale, broccoli, sweet potato, walnuts, almonds, flax seeds, chia seeds, berries, citrus fruits, quinoa, mushrooms, and green tea provide biologically active compounds associated with oxidative balance, endothelial circulation, connective tissue support, inflammatory regulation, and follicular resilience. Adequate hydration, balanced mineral intake, fiber-rich whole foods, and antioxidant-rich plant compounds may help support healthier hair structure and reduce environmental oxidative burden affecting hair integrity.