Tag: Fuel metabolism

Mild ketosis can occur after just 12 to 14 hours of fasting as the body begins to use fat for energy. However, this metabolic state can become dangerous when caused by starvation, which forces the body into a survival mode due to a severe lack of carbohydrates and calories.

Over half of our daily calories, typically 45-65%, should come from carbohydrates according to the Dietary Guidelines for Americans. In fact, carbohydrates are the body's primary and preferred fuel source, especially for high-intensity activities and for fueling the brain. This fuel preference is determined by a complex interplay of activity level, food availability, and the body's metabolic efficiency.