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The truth is doctors and scientists don't know what causes most types of cancer. Yes, some lifestyle behaviors, such as smoking, can increase your risk. It doesn't happen in most people, says medical oncologist Dale Shepard, MD, PhD.

Q: My doctor ordered an abdominal ultrasound as part of my routine checkup. I was surprised to learn I have a 3.7 centimeter abdominal aneurysm. I suspect your doctor ordered the test because she or he was following the United States Preventive Services Task Force guidelines.

"The Western diet was developed and promoted by companies who want us to eat their food, so they make it hyper-palatable, meaning it hits all our buttons so we overconsume. Eating a Mediterranean diet should allow people to enjoy their food and not overeat, which is such a problem in this country."