Their diet primarily consists of lean meats with lots of fruits and vegetables. Even today, everything they eat goes into a food journal.
http://edition.cnn.com/2013/10/14/health/weight-loss-sheltons/
More from my site
Mike Walliams swam across the English channel
Study: Indians feel older earlier than Japanese, Swiss
Telegraph: Rise and fall of the no-fat fad
Dr Rajat Chauhan on low-carb for athletic performance
Sami Inkinen: You feel good when you eat 5000 calories of saturated fat
Study: The keto diet is safe for obese patients