The gallbladder concentrates and stores bile as a pear-shaped sac which it can release to help digestion after a fatty meal.
Health foods are those that according to popular belief promote good health. The evidence that health foods work is largely anecdotal and perceptions regarding the nutritional attributes of many food items are changing as we learn more. An example of health food is wheatgrass juice which is considered a panacea by proponents of wheatgrass juice therapy but there is no scientific evidence to back their claims. Cultural influences and traditional systems of medicine also play a part in propagating certain food items and according them attributes which make them very useful under certain circumstances.