Sphingolipids are ubiquitous components in eukaryotic
organisms
and have attracted attention as physiologically functional lipids.
Sphingolipids with diverse structures are present in foodstuffs as
these structures depend on the biological species they are derived
from, such as mammals, plants, and fungi. The physiological functions
of dietary sphingolipids, especially those that improve skin barrier
function, have recently been noted. In addition, the roles of dietary
sphingolipids in the prevention of diseases, including cancer and
metabolic syndrome, have been studied. However, the mechanisms underlying
the health-improving effects of dietary sphingolipids, especially
their metabolic fates, have not been elucidated. Here, we review dietary
sphingolipids, including their chemical structures and contents in
foodstuff; digestion, intestinal absorption, and metabolism; and nutraceutical
functions, based on the available evidence and hypotheses. Further
research is warranted to clearly define how dietary sphingolipids
can influence human health.