Lyle McDonald is a physiologist and author who has spent over a decade obsessively finding ways to apply cutting-edge scientific research to sports nutrition, fat loss and muscle growth.

Lyle McDonald became interested in the science of exercise and nutrition in high school through his involvement in martial arts, triathlon, gymnastics and weight training. This led him to pursue a bachelor's of science degree in Kinesiology from the University of California at Los Angeles. The curriculum included an overwhelming amount of basic human physiology, anatomy, biochemistry, endocrinology as well as coursework in exercise physiology, biomechanics and nutrition. After graduation in 1993, he got involved in personal training in a variety of settings. From this time until the present is when he really learned about some of the realities about training, nutrition etc.