Oxidative Priority, Meal Frequency, and the Energy Economy of Food and Activity: Implications for Longevity, Obesity, and Cardiometabolic Disease

Interesting summary of research on fasting and oxidative priority of energy sources.

Some notes:

Oxidative order is based on how readily a fuel source can be stored:

  1. Alcohol has no storage capacity in the body, consumed first
  2. Protein has very limited storage capacity in tissue, consumed second
  3. Carbohydrates can be readily stored as glycogen, consumed third
  4. Fat has almost unlimited storage in adipose tissue, consumed last

  5. Above can be used to understand obesity in western diet. Excess carbohydrates pre-empt burning fat, while excess fat is steadily accumulated

  6. Fasting first burns through glycogen stores, then burns fat from adipose tissue
  7. "Chronic postpandrial state" due to ready availability of food at all times
  8. Cold changes metabolism to favor burning fat. The authors have a separate article entirely dedicated to this topic.