Subject
Humans; Adaptation; Body Weight; Body Composition; Homeostasis; Alanine/me [Metabolism]; Brain/metabolism; Carbohydrate Metabolism; Fasting; Gluconeogenesis; Ketones/metabolism; Kidney/metabolism; Liver/metabolism; Physiological; Proteins/metabolism; Sodium/metabolism; Starvation/metabolism; Triglycerides/metabolism; Water-Electrolyte Balance