Word: b12
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Another reason is that vegans skew the stats, because their strict avoidance of meat, eggs and dairy products can lead to deficiencies in iron, calcium and vitamin B12. "These nutrients are the problem," says Johanna Dwyer, a professor of nutrition and medicine at Tufts University. "At least among the vegans who are also philosophically opposed to fortified foods and/or vitamin and mineral supplements...
...says it is possible to raise kids as vegans but cautions that special care must be taken with nursing infants (who don't develop properly without the nutrients in mother's milk or fortified formula). Other researchers warn that infants breast-fed by vegans have lower levels of vitamin B12 and DHA (an omega-3 fatty acid), important to vision and growth...
...teens usually have abundant calcium intake. For vegans, however, consuming adequate amounts of calcium without the use of fortified foods or supplements is difficult without careful dietary planning. Among vegan youth who do not take supplements, there is reason for concern with respect to iron, calcium, vitamins D and B12, and perhaps also selenium and iodine...
...badly don't know how to navigate in the vegetarian world. They eat more bread, cheese and pastry products and load up on salad dressing. Their saturated-fat intake is no lower than red-meat eaters, and they are more likely to consume inadequate amounts of vitamin B12 and protein. They may think they are healthier because they are some sort of vegetarian and they don't eat red meat, but in fact they may be less healthy...
...that easy for the rest of America, either. Middle-aged to elderly adults can also develop deficiencies in a vegetarian diet (as they can, of course, with a poor diet that includes meat). Deficiencies in vitamins D and B12 and in iodine, which can lead to goiter, are common. The elderly tend to compensate by taking supplements, but that approach carries risks. Researchers have found cases in which vegetarian oldsters, who are susceptible to iodine deficiency, had dangerously high and potentially toxic levels of iodine in their bodies because they overdid the supplements...