The Zone Diet,

popular among a number of Hollywood celebrities, was developed in the 1970s by Dr. Barry Sears based. It's based on the principle that each meal should have a nutritionally balanced amount of proteins and carbohydrates. A meal would ideally consist of 40% carbohydrates (from fruits and vegetables), 30% lean or low-fat protein, and 30% "good" fats, hence the program's nickname: the 40:30:30 diet.

The Zone wasn't created primarily as a weight loss system; its main purpose is to maintain wellness by correcting and maintaining insulin levels, However, people have lost weight doing the Zone diet, as our interviewees show, and that it's a way of eating that's maintainable for life.

• CrossFit and the Zone Diet: The "holy grail" of health for Maximus
  The Zone Diet and the CrossFit fitness program are integral parts of Maximus' journey to weight loss, fitness, and better health. It may not have been easy going back to being athletic and developing healthier eating habits, but the hard work and discipline have been worth it. Here, Maximus shares some of his weight loss and exercise tips, and discusses his commitment to his lifestyle change.