Infants, children, adolescents, and pregnant and lactating women have
been described as groups with special needs. Regardless of diet chosen
, these groups are at higher risk for nutritional deficiencies than ad
ult males. Vegan diets can be safely used by these groups if foods, an
d in some instances supplements, are selected which provide a healthfu
l and nutritionally adequate diet. Guidelines have been developed for
those choosing to follow vegan diets. In many instances vegan diets of
fer health benefits. Studies of vegans are limited by factors such as
heterogeneity of diets, the size and extent of this type of study, and
difficulty in subject identification. There is a scarcity of studies
of ''newer'' vegetarians who are often more mainstream than the vegeta
rians of the 1960s and 1970s. In some instances this has led to assump
tions about today's vegans which are based on out-dated information. T
horough scientific studies of today's vegetarians, especially of those
in groups with special needs, are needed.