How about a whole swimming team? Check out the chapter titled, "Elite Athletes in The Zone" in the book, "Enter the Zone", by Barry Sears. He took the Stanford University swim team and placed them on the Zone diet. The took 8 gold medals in Barcelona, Spain in 1992.
The Zone diet advocates calories allocated as 30% from protein, 30% from fat and 40% from carbohydrates. The total caloric intake is keyed to the number of pounds of lean body mass and level of physical exercise. A 200 lb weight lifter with 15% body fat would consume 170 grams of protein to maintain that lean body mass. Total daily calories would be 2266 as 680 calories of protein, 680 calories of fat (75 grams) and 906 calories of carbohydrate (226 grams). A relatively sedentary person with similar body composition would eat half that amount in the same relative proportions.
I used the Zone diet starting in June 1996. Starting at 204 lbs in June, I had dropped to 187 by mid-November. By April 1997 I was at 173. I reached 163 in June 1997. During that time frame, my exercise was inline speed skating. In June 1996, I could manage 5 miles in about 28 minutes. A year later, I did 15 miles in 66 minutes. Less blubber to push around and far more fit. The exercise was a requirement for me to make any progress. I had cancer in 1985 and the net effect of the treatments was to severely reduce my metabolic rate.
Proportionately, my eating habits fit the "zone" fairly well. But, I tend to maintain my weight at about 3000 calories per day. I haven't counted what I eat for quite a while, but that was where I stood a few years ago. I'm essentially the same weight not, +/- 10 pounds.
Haven't had the bodyfat calipers done, but the rough estimate by the charts (waist / weight ratio) puts me at around 18% which is acceptable though I'd prefer around 14-15%. But I don't care about it enough to actually strive for that goal. I have too much other stuff to worry about.