Veg, Non-Veg, or Vegan? 5 Things Each Diet Does to Your Body — And What the Science Actually Says

This article examines the evidence-based health outcomes of vegetarian, non-vegetarian, and vegan dietary patterns without declaring any pattern superior, providing an impartial review of confirmed benefits, risks, and nutritional implications. Drawing on a 2024 umbrella review of 21 systematic reviews (UC Irvine, American Journal of Preventive Cardiology) confirming 15% CVD risk reduction; a Nature Microbiology January 2025 study of 21,561 individuals mapping gut microbiome signatures; IARC 2015 classification of processed meat (Group 1 carcinogen) and red meat (Group 2A); Warwick Medical School 2024 review of plant-based diet nutritional deficiencies; and Lancet 2024 Indian micronutrient data, the article documents five dimensions of each diet's physiological effects. India-specific data is examined in depth — 47% B12 deficiency among vegetarians, 53% anaemia in adult women, 70%+ vitamin D deficiency in urban adults, 73% protein deficiency. Evidence-based solutions for each diet's nutritional gaps are provided. The Taittiriya Upanishad's Annam Brahma, the Srimad Bhagavatam's Jiva Jivasya Jeevanam, and the Ayurvedic Sattvic-Rajasic-Tamasic food classification are presented as the ancient Indian frameworks that anticipated the science of food quality over food category. A dedicated section separates diet from religious identity through both the Upanishadic framework and the scientific principle that the body processes nutrients regardless of their cultural or religious context.