Winter is associated with increased susceptibility to infections, metabolic stress, reduced sunlight exposure, and greater nutritional demands, making a balanced and functional diet essential for maintaining health and immunity. Seeds such as flaxseed, chia, sesame, sunflower, and pumpkin seeds are nutrient-dense foods rich in essential fatty acids, proteins, dietary fiber, vitamins, minerals, antioxidants, and bioactive phytochemicals that collectively support physiological resilience during the winter season. These seeds provide important micronutrients including vitamin E, zinc, magnesium, selenium, and iron, which act as cofactors in enzymatic reactions, enhance immune function, regulate metabolism, and protect cells against oxidative damage. Their antioxidants and phytonutrients, such as lignans, flavonoids, and phenolic compounds, help neutralize reactive oxygen species and reduce inflammation, while dietary fiber improves digestive health, supports beneficial gut microbiota, and promotes the production of short-chain fatty acids that strengthen immune responses. Additionally, essential fatty acids and antioxidants contribute to skin and mucosal integrity by maintaining membrane stability, hydration, and tissue repair during cold and dry weather. The combined biochemical synergy of these nutrients enhances nutrient bioavailability, metabolic efficiency, and overall health, making seeds an economical, natural, and science-based functional food for strengthening immunity, maintaining metabolic balance, and improving resilience against seasonal stress during winter.