As mentioned above, lacto-ovo vegetarians can eat everything except meat and fish. Given the quality and variety of mock meat products available these days, it’s a fairly sustainable diet. It’s still more restrictive than an omnivorous “high-quality” diet, however, and the available research suggests that it is not healthier than such a diet.
For example, a 2006 review of the literature reported that “several prospective studies showed no significant differences in the mortality caused by colorectal, stomach, lung, prostate or breast cancers and stroke between vegetarians and ‘health-conscious’ non-vegetarians.”
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