Originally Posted by Hugh-Hefner's-Son
I will post the summary of the article I was refering to, it comes from AST Sports Science physiologist Paul Cribb :
Many people that want to shed body fat will perform their exercise first thing in the morning without some form of breakfast. They do this with the misguided belief they are tapping into fat stores and forcing their body to burn fat for fuel. This information originated many years ago from outdated research performed on obese subjects. However, effective fat loss for people that are not fat is a much trickier objective. I won’t go into the numerous physiological aspects of why it is a terrible decision for healthy people to avoid nutritional support before exercise in the morning. I will tell you that you cannot dictate the type of fuel you want your body to utilize during exercise— human physiology is far too intricately balanced.
Exercising in the fasted state (in morning, on an empty stomach) induces a tremendous amount of muscle breakdown, (along with a small amount of fat loss). This is a one-way ticket to a slower metabolism and a body that quickly learns to hoard fat, not burn it. After 7 or 8 hours of sleep your metabolism has slowed down. Breakfast kick-starts your metabolic rate and creates an instant anabolic environment within the body. To lose body fat from exercise, the correct nutritional support that preserves lean body mass must be present.