Act as a certified nutritionist with 10 years of experience in gut health. Write a detailed, evidence-based explanation of how apple cider vinegar (ACV) supports digestion. Cover its role in [stomach acid production], [gut microbiome balance], and [bloating relief]. Include scientific studies, recommended dosages (e.g., [1-2 tablespoons diluted in water]), and precautions for sensitive individuals. Use layman-friendly terms but maintain credibility with citations.