I say that vegetarians are deficient in creatine because this study showed that supplements increased their mental abilities. When they did the same study with meat-eaters, there was no such improvement, indicating that omnivores are not deficient in creatine.
Rawson ES, Lieberman HR, Walsh TM, Zuber SM, Harhart JM, Matthews TC (September 2008). "Creatine supplementation does not improve cognitive function in young adults". Physiology & Behavior 95 (1-2): 130–4. doi:10.1016/j.physbeh.2008.05.009. PMID 18579168.
I don't know why you're so defensive about this. It's well known that vegetarians are deficient in many nutrients. It's also well known that humans have an omnivorous past, so it should be obvious logically well.
Creatine supplements for meat-eaters increase physical stamina. It's one of the most sold products in "power sports" along with protein supplements. Ask the jocks to get the word from the horse's mouth, then tell me they too suffer a Creatine deficiency. :)
Rawson ES, Lieberman HR, Walsh TM, Zuber SM, Harhart JM, Matthews TC (September 2008). "Creatine supplementation does not improve cognitive function in young adults". Physiology & Behavior 95 (1-2): 130–4. doi:10.1016/j.physbeh.2008.05.009. PMID 18579168.
I don't know why you're so defensive about this. It's well known that vegetarians are deficient in many nutrients. It's also well known that humans have an omnivorous past, so it should be obvious logically well.