Children who don't eat meat, eggs or dairy products could be at risk of learning difficulties at school, doctors have suggested. A study in the Netherlands found that children with low levels of the vitamin B12 in their blood appear less able to reason, solve complex problems and process abstract thoughts. Vitamin B12 is a vital vitamin found in meat, eggs and dairy products, but not in vegetables. Dr Wija Van Staveren, one of the authors, claimed that unless children have adequate intake of vitamin B12 during early childhood, problems may occur regardless of moderate vitamin B12 intake later in life. However B12 should not be a major problem for children overall because they tend to get a lot in a balanced diet.