You may have always wondered how a supermodel like Gisele Bündchenmaintains her enviable slim and toned figure. Now, thanks to her and her husband Tom Brady‘s personal chef, you needn’t wonder any longer.Allen Campbell has told Boston.com that the superstar couple’s diet is made up of 80 per cent vegetables.“So, 80 percent of what they eat is vegetables. [I buy] the freshest vegetables. If it’s not organic, I don’t use it,” says the private chef, adding that he also cooks with “whole grains: brown rice, quinoa, millet, beans” for the famous Boston-based family.If you’re wondering what the other 20 per cent of their diet is made up of, it’s lean meats: “Grass-fed organic steak, duck every now and then, and chicken....