In biological terms, a character that is reduced is one that the ancestors of an organism used to posses and use, but that is now not necessary and so often reduced in size, usefulness and so function. A good example would be the appendix of humans that used to be used for cellulose digestion, but is now a simple blind-ended tube in the digestive system, or the wings of penguins, now not needed for flight. This type of reduction is generally a result of passive evolution (drift). Another meaning for reduced is where a characteristic has been specifically altered and often reduced in size because of active selection; for example, the leaves of cacti are reduced to spines, and the stem has taken over the job of photosynthesis. The reduced leaves/spines are important for protecting the plant from grazing animals, and so active selection has encouraged their development.
To qualify as "reduced", a nutritionally altered product must contain at least 25% of a nutrient or of calories than the regular, or reference, product; However, a reduced claim cannot be made on a produ;