The more you weigh the greater your risk for some types of cancer , according to a new report by the American Institute for Cancer Research . The results show how obesity may alter the body's systems to pave the way for cancerous tumors to develop. "If we lost weight, the nation's health would improve, and we would have less cancer," said Dr. George Bray of Louisiana State University Medical Center. Just how is obesity linked to cancer? The problem, researchers say: in an obese person, there are more fat cells constantly producing more of the chemicals that cause cells to be more likely to turn into cancer. Scientists say obese people are at a higher risk for colon, prostate, uterine, kidney and breast cancer. "The fatter you are, the more estrogen your fat tissue is making and estrogen is a major factor relating to breast and endometrial cancer and possibly gall bladder cancer in women," said Bray. So what can you do? Researchers say regular exercise and a healthy diet are essential, including spices like oregano, rosemary, ginger and tumerric which could contain cancer fighting properties.