Basically the women are on 1200 calories and the men 1500 and they do cycle, like once a week (1500-1800). Ratios aren't really part of it, but higher protein, lower carb and lower fat are encouraged. They average 6 hours a day in the gym during the season. The show portrays them getting weighed every 7 days, but sometimes there's a longer time inbetween. Adds to the drama. They also manipulate the scale A LOT with water. A trainer is provided during the season, if they get voted off. After the finale, I think they're on their own.