Transitioning to a vegetarian or vegan diet should be done safely to prevent nutritional deficiencies. Start by gradually incorporating more plant-based foods such as fruits, vegetables, legumes, and whole grains while reducing animal products. Plan balanced meals to ensure adequate intake of essential nutrients, including protein, iron, calcium, and vitamin B12. Consider consulting a nutritionist to ensure dietary needs are met. Monitoring how your body responds during this transition is also crucial; adjustments may be required based on personal health or energy levels.