Nausea is an unsettled upper digestive sensation that can involve queasiness, loss of appetite, stomach heaviness, sensitivity to smell or movement, increased salivation, burping, bloating, or the feeling that the stomach is not emptying normally. It is not a single pathway problem. It reflects communication between the stomach, small intestine, liver-bile system, gut microbiome, vagus nerve, brainstem nausea centers, hormones, inflammatory signals, stress-response pathways, and hydration-electrolyte balance. Food pattern, meal size, fat density, blood-sugar swings, dehydration, and gut irritation can all influence how strongly nausea is felt. Nausea often appears when the stomach is distended, when gastric emptying is delayed, when the intestinal lining is irritated, when bile flow is poorly matched to meal composition, or when stress signaling changes motility and gut sensitivity. High-fat meals, fried foods, oils, meat-heavy meals, dairy-rich meals, alcohol, refined sugar, artificial sweeteners, emulsifiers, excess sodium, and ultra-processed foods can increase digestive burden. Concentrated fat slows gastric emptying and can intensify fullness and queasiness. Highly processed foods can combine refined starch, chemical additives, salt, sweeteners, and low fiber density, which may affect gut barrier function, microbial balance, and post-meal metabolic stability. A P53 Nutrition pattern is classified as 100% whole-food plant-based nutrition with no oils, meat, dairy, or toxins. For nausea, this means gentle, lower-fat meals built from water-rich fruits, cooked vegetables, intact grains, and small portions of legumes as tolerated. Bananas, apples, oats, brown rice, potatoes, sweet potatoes, carrots, pumpkin, cucumber, celery, romaine lettuce, spinach, and ginger are whole plant foods that can provide structure without concentrated fat. These foods supply water, potassium, magnesium, vitamin C, vitamin B6, folate, carotenoids, flavonoids, soluble fiber, resistant starch, and polyphenols that support digestive rhythm, hydration, gut barrier function, microbiome balance, and antioxidant defense. Nausea connects biologically to gut-microbiome, epithelial-barrier-integrity, hydration-electrolyte-balance, stress-response, scfa-signaling, bile-acid-synthesis, nfkb-pathway, glutathione-defense, and serotonin-melatonin because enteroendocrine signaling, serotonin activity, vagal input, inflammatory mediators, bile handling, and fluid balance all influence digestive sensation. Ginger phytochemicals such as 6-gingerol and 6-shogaol have been studied for nausea-related gastrointestinal signaling. Polyphenols including quercetin, catechin, epicatechin, egcg, chlorogenic-acid, apigenin, luteolin, and rosmarinic-acid are studied for microbiome, antioxidant, and inflammatory pathway interactions. The nutritional focus is steady hydration, potassium-rich plants, gentle cooked foods, lower fat density, soluble fiber, meal spacing, and avoidance of oils, meat, dairy, alcohol, fried foods, artificial sweeteners, emulsifiers, and ultra-processed foods.