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What you mean is catabolic not cannibalist. Catabolism is actually how people lose weight and yes vegetarians tend to be on the lower side of the BMI but this is not necessarily a negative in terms of health. It depends on how the body is composed (muscle to fat) and not so much how big the body is.

I look forward to seeing your post on this topic.

References

  1. https://en.wikipedia.org/wiki/Catabolism