Some bitter fruits include grapefruits, bitter melons, olives, crabapples and bitter oranges. Some lesser-known bitter fruits include sandcherries, buffaloberries and the berries of the mountain ash tree. These berries, however, have a toxic effect when eaten in large quantities and should be consumed with caution.
Even though bitter fruits tend to have an undesirable flavor when eaten alone, they may offer health benefits. Bitter fruits, vegetables and herbs stimulate digestion and increase nutrient absorption. Bitter fruits also contain nutrients that fight free radicals, aid in natural detoxification and boost metabolism and immune system function. Ayurvedic practitioners also believe that bitter fruits aid in weight loss by reducing sweet tooth cravings and water retention.