Lab research has shown that compounds in citrus fruits such as limes, called limonoids, can help fight lung, breast, stomach and colon, skin, and mouth cancers. The interesting factor regarding this compound is that limonin glucoside, which is easily digested, can attach itself to sugar molecules and neutralize the negative affects of the sugar, while at the same time having the capacity to last much longer in the body - up to 24 hours in lab tests - whereas the phenols that come from chocolate and green tea only stay active for four to six hours.