I ride 1200-1700km a month in summer and 1000-1400km in the winter. With that kind of distance keeping weight off is easy, but 350miles in 3 months would have me gaining weight fast. As for no carbs, thats a really bad idea if you want to cycle any distance at all. Your body needs fuel and if you have low reserves of fat anyway you need the carbs to keep those legs moving.
