2,000 Calories a day is used for general nutrition advice, but calorie needs vary. Dunkin' Donuts has made a reasonable effort to provide nutritional and ingredient information based upon standard product formulations and following the FDA guidelines using formulation and nutrition labeling software.
Definition of system for English Language Learners. : 1  a group of related parts that move or work together. : 2  a body of a person or animal thought of as an entire group of parts that work together. : 3  a group of organs that work together to perform an important function of the body.
Systems theory. Systems theory or systems science is the interdisciplinary study of systems. A system is an entity with interrelated and interdependent parts; it is defined by its boundaries and it is more than the sum of its parts (subsystem). Changing one part of the system affects other parts and the whole system, with predictable patterns of behavior.