About 84% of Vegetarians and Vegans give up on the diet and return to meat.
https://www.psychologytoday.com/blog...eturn-meat-why

The implications of this study are important. Only 2% of Americans do not eat any animal products. (This number has not changed appreciably for 20 years). Further, the fact that five out of six vegetarians go back to eating meat suggests that an all-veggie diet is very hard for most people to maintain over the long haul. Hence, the authors of the report argue that animal protectionists would be better off concentrating their efforts to persuade “the many” to reduce their consumption of flesh than trying to convince “the few” to take the absolutist route and give up meat completely.