On "Sunday Housecall" today, Dr. David Samadi, professor, Chairman of Urology and Chief of Robotic Surgery at Lenox Hill Hospital, weighed in on a new study that suggests obesity could make prostate cancer much more aggressive.

Dr. Samadi said this is big news because obesity typically makes people think about high blood pressure, high cholesterol and diabetes, not aggressive prostate cancer.

Dr. Samadi explained that visceral fat - fat inside the body - surrounding the prostate can secrete hormones that feed tumor cells and increase cancer.

He said this study - which examined more than 191,000 patients with prostate cancer - is a game-changer and may lead to obesity being listed as a risk factor alongside things such as family history.

Dr. Marc Siegel added that it's particularly troubling that it is often advanced prostate cancer found in obese patients.

"We're finding more and more aggressive cancer among young men out there now, with obesity becoming a real epidemic," Dr. Samadi remarked.

He said that if you have been diagnosed with prostate cancer in the last 4 to 6 months, you can call 212-365-5000 or visit ProstateCancer911.com, the most comprehensive resource on prevention, diagnosis, treatment and recovery.

"You can send your information and we're able to help you, free of charge, and that has changed a lot of people's lives," Dr. Samadi said.

Watch the clip above.