High altitude appetite loss is a common physiological response associated with rapid elevation gain, reduced oxygen availability, altered gastrointestinal signaling, dehydration, and metabolic stress adaptation. Many individuals experience reduced hunger, early fullness, nausea, low calorie intake, altered taste perception, fatigue, and unintended weight loss while exposed to high elevations. Hypoxia-related stress responses can influence appetite-regulating hormones, digestive blood flow, mitochondrial energy metabolism, and nervous system signaling associated with hunger perception and gastric comfort. Reduced atmospheric oxygen exposure may alter ghrelin activity, leptin signaling, stress hormone balance, and autonomic nervous system regulation. Circulatory redistribution during altitude exposure can reduce digestive efficiency while increasing respiratory demand and fluid losses through respiration. This combination may contribute to decreased appetite, reduced meal tolerance, low energy intake, and impaired hydration status. Fatigue, dry air exposure, electrolyte shifts, and oxidative stress may further amplify appetite suppression and metabolic strain. A whole food plant-based dietary pattern emphasizing calorie-dense whole plant foods, hydration-supportive fruits, potassium-rich vegetables, mineral-containing legumes, antioxidant-rich berries, and easily digestible starches may help support energy intake and metabolic adaptation during high altitude exposure. Smaller frequent meals containing nutrient-dense plant foods may support digestive comfort while helping maintain calorie intake during periods of reduced appetite. Foods such as banana, avocado_hass, oats-cooked, quinoa-cooked, sweet-potato-orange, pumpkin-seeds-dried, almond-raw, walnut-english-raw, chickpeas, brown-rice-cooked, papaya, blueberry, and green-tea-brewed contain minerals, amino acids, antioxidants, polyphenols, fiber, and complex carbohydrates associated with mitochondrial support, electrolyte balance, circulatory stability, and oxidative defense systems. Potassium-rich foods may support hydration-electrolyte balance pathways while antioxidant-containing fruits and vegetables may help support cellular responses to hypoxia-related oxidative stress. Polyphenols, carotenoids, catechins, anthocyanins, magnesium-containing foods, and nitrate-containing vegetables may help support endothelial function, oxygen utilization efficiency, vascular circulation, and mitochondrial metabolism. Maintaining adequate hydration, regular meal timing, moderate fiber progression, and nutrient-dense plant foods may help support digestive tolerance and metabolic resilience during altitude exposure. Whole plant foods providing carbohydrates, minerals, hydration support, and antioxidant compounds may assist normal physiological adaptation to elevated environments while supporting energy availability and circulatory function.