Cayce Berryman / Reporter With mounting expenses that can include tuition, books, food, gas, housing and more, college students are used to living on a budget. But with a hectic lifestyle of classes, work and family, costs can quickly get out of hand. “I probably spend $150 on fast food in a week,” said Catherine Sieber, a first-year sonography major at Del Mar College. In a 16-week semester, Sieber spends about $2,400 on fast food alone, more than quadrupling her $550 tuition cost. Sieber is not alone, of course. According to the Huffington Post, college students spend more money on…