A small UK study on 30 obese or overweight men found that those
who exercised before breakfast burned twice the fat as men who ate breakfast
before they worked out. Exercising with no fuel forces the
body to turn to stored carbs, and when those are quickly gone, to fat cells.
In addition, it did also have "profound and positive" effects on the health of the group that fasted: skipping the meal before exercise made the men's muscles more responsive to insulin, which controls high blood sugars, thus reducing the risk for diabetes and heart disease.
"The group who exercised before breakfast increased their ability to respond to insulin," said exercise physiologist Javier Gonzalez, an associate professor in the department for health at the University of Bath.
In addition, it did also have "profound and positive" effects on the health of the group that fasted: skipping the meal before exercise made the men's muscles more responsive to insulin, which controls high blood sugars, thus reducing the risk for diabetes and heart disease.
"The group who exercised before breakfast increased their ability to respond to insulin," said exercise physiologist Javier Gonzalez, an associate professor in the department for health at the University of Bath.
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