At this stage, with the Games underway and many athletes still waiting to begin their competitions, the emphasis is on refinement as opposed to strength building. It varies depending on where we are in the year, says Corones, who works for the New South Wales Institute of Sport in Sydney. Earlier on we want them to be carrying a bit of extra weight to reduce the chances of injury and illness, but then when it gets down to racing it's stripped down to the bare minimum, she says. We do n't really get them to count calories, we more look at what areas of food groups they 're eating from. You 're looking at getting quality fats, making sure you get enough carbohydrates, and also the timing of the meal -- if you 're swimming or doing gym. If you 're doing gym there's a greater mechanical breakdown of the muscle so we need to eat more protein post the session, with a little bit pre the session. A big part of Coronesjob is making sure athletes learn the right food habits -- and this generally means breaking eating patterns formed at a young age. It's a pretty big education process for the athletes. There are still some that struggle with that concept that the less processed it is, the better it is for them, she says. Often early on in their careers, in their young teens, they do a lot of training and they want to grab the first thing that's quickest available because they 're