Final answer:
Glycogen stores in a healthy 70 kg man can sustain normal activities for approximately 1 day. Glycogen is stored in the liver and muscles and is used to maintain blood glucose levels and provide energy during exercise. After 1 day without food, the body would turn to other energy sources.
Step-by-step explanation:
The question revolves around how long glycogen stores can sustain normal activities in a healthy 70 kg man. Glycogen is the primary energy storage form of glucose in humans, predominantly stored in liver and muscle cells. The liver glycogen is crucial for maintaining blood glucose levels, whereas muscle glycogen is readily used during vigorous exercise.
A healthy individual’s glycogen reserves are typically sufficient to maintain metabolic balance during a short-term fast. Glycogen metabolism, which includes glycogenesis and glycogenolysis, ensures that energy is available when carbohydrate intake is low or during physical exercise.
As for the duration that glycogen stores can sustain normal activities, it is generally understood that these reserves are enough to support a person for about 1 day without food. Beyond that, the body would begin to utilize other energy pathways and stores, including the breakdown of fat and protei