❓Is it true, as some claim online, that "eating vegetarian increases cancer risk"?

This claim runs exactly opposite to the current mainstream evidence-based medical consensus. The International Agency for Research on Cancer, part of the World Health Organization, has long classified processed meat as a Group 1 carcinogen (confirmed to cause cancer) and red meat as a Group 2A carcinogen (probably causes cancer). Multiple large cohort studies show that a diet centered on vegetables, fruit, whole grains, and legumes is actually associated with lower rates of colorectal cancer and several other cancers. The "vegetarian diets carry higher cancer risk" misconception probably comes from taking a rare, unbalanced extreme case — like a long-term overly narrow vegetarian diet lacking certain micronutrients — and treating it as a general conclusion, which is a classic overgeneralization. Right now there's no reliable large-scale research supporting the idea that vegetarianism itself increases cancer risk — if anything, most of the evidence points the opposite direction. When you come across a claim like this, it's worth checking whether the source is backed by rigorous research, rather than just trusting an unsourced rumor online.