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Humans may not have survived through the last ice age quite as far north or south but may well have been able to survive without meat closer to the equator, although I very much doubt being vegan was thought about at the time. Past is in the past though and in some parts of the world a meat free diet is a perfectly healthy option. The crap about vegetarian diets needing to watch out for certain deficiencies is not to do with being vegetarian, just poor diet, just as likely to happen to an omnivore with a poor diet, there is plenty of iron in all sorts of stuff, moreso per calorie than meat in a lot of cases. The only exception is B12 and it's easy to get enough of that in various ways, although takes a little more thought as a vegan rather than veggie.
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snottyotter
No offence at all. It's just healthy discussion. In this country we may with careful dietics be able acquire all the nutrients we need in balanced way. Vegetarians can alot of the time fall into certain defecincy if they eat without thought...esp things like iron. In many countries most food is seasonal. For example Iron from spinach will be winter only and therefore meat is required to cover other times when you don't have the ability to import from opposite hemisphere.
This is problematic too because it's not fresh or environmentally friendly neither.
Humans as a race would not have survived if they didn't eat meat during the ice age. But when times are better farming is the most safest form of acquiring food, persistent hunting would have been quite dangerous way to get food and would have been a way to get food when need be. Until we decided to breed and domesticate them and completely f..ed there genetics to suit or vain needs.