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For digestive issues like bloating, diarrhea, or constipation, dietary adjustments are often the first step. A high-fiber diet, adequate hydration, and avoiding highly processed foods are generally recommended. Many people benefit from a low-FODMAP diet, which reduces short-chain carbohydrates that ferment in the gut. However, this diet is not intended for long-term use and should be medically supervised. Microbiome tests, such as those offered by MyBody-X, can show bacterial diversity but do not diagnose specific conditions. The evidence for direct dietary recommendations from such tests is weak (observational). Genetic tests, e.g., for FUT2 (secretor status), may offer clues about carbohydrate processing, but clinical relevance is limited. Important: Persistent symptoms require a medical evaluation to rule out serious causes. Self-experimentation with elimination diets can lead to nutrient deficiencies. Overall, the evidence for personalized nutrition in digestive issues is mixed – mechanistic and observational studies exist, but robust randomized controlled trials are lacking.