A nutrition management system including a patient mobile application stored on non-transitory computer-readable media in electronic communication with a home nutrient-testing device, and a dietitian's software stored on non-transitory computer-readable media in electronic communication with the patient mobile application. A method of nutrition management, by a patient testing their nutrition levels on a home nutrient-testing device, and creating personalized daily dietary recommendations on a meal-by-meal basis for the patient based on results from the home nutrient-testing device. A kitchen device for creating hot and cold meals or drinks, including an ingredient chamber, an interface screen in electronic communication with said ingredient chamber, and an accessible preparation chamber in operable connection with said ingredient chamber and in electronic communication with the interface screen, the kitchen device being in electronic communication with a patient mobile application stored on non-transitory computer-readable media. A method of using the kitchen device.