1. A multi-sensor caloric intake monitoring and modifying system comprising: a smart watch or wrist band, wherein the smart watch or wrist band is worn by a person; a necklace or neck band, wherein the necklace or neck band is worn by the person; a spectroscopic sensor that is part of the smart watch or wrist band, wherein the spectroscopic sensor collects data concerning light that is absorbed by or reflected from food; a camera that is part of the necklace or neck band, wherein the camera takes pictures of the food; a microphone that is part of the necklace or neck band, wherein the microphone monitors sounds associated with eating the food; a data processor which analyzes data concerning light that is absorbed by or reflected from the food from the spectroscopic sensor, pictures of the food from the camera, and sounds associated with eating the food from the microphone, wherein analyzing the data comprises: creating multi-dimensional food attribute vectors, identifying the food based on the vector, and monitoring the person's food consumption based on the identified food; and a buzzer, vibrator, or alarm that is part of the smart watch, wrist band, necklace, or neck band, wherein the buzzer, vibrator, or alarm provides auditory and/or tactile feedback to the person in order to modify the person's food consumption.