There is a warning out today for overweight and obese men.
If you get prostate cancer, your outcome could be a lot worse than someone who is fit.
More than 750 men with prostate cancer, and between the ages of 40 and 64, participated in a new study.
Researchers found that how much a man weighed greatly affected how well he recovered.
They also found obese men are more than twice as likely as leaner men to die from prostate cancer.
The risk stayed the same no matter what kind of treatment the men got for their cancer.