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The problems with fatigue, apathetic behaviour and concentration are mostly a result from a lack of iron in the diet. However as with any diet this is only a problem when not eating the right things, this regularly means that such iron deficiency can be a problem in the developing world where vegetarians have little choice – usually eating little else except what they grow, normally just cereals. “Although the iron stores of vegetarians are sometimes reduced, the incidence of iron-deficiency anaemia in vegetarians is not significantly different from that in the general population”, there are plenty of sources of iron that can be eaten by vegetarians such as legumes and whole grains that are a substantial part of most western vegetarian’s diets meaning it is not a problem. [1] Research done in Australia concludes that "There was no significant difference between mean daily iron intakes of vegetarians and omnivores". [2]  [1] David Ogilvie, Nutrition: Iron and Vegetarian Diets, Vegetarian Network Victoria, September 2010.  [2] Madeleine J Ball and Melinda A Bartlett, ‘Dietary intake and iron status of Australian vegetarian women’, American Society for Clinical Nutrition, 1999