Adults ages 24-49 need to take a hard look at their weight. 

Six obesity-related cancers are showing up increasing numbers of young adults according to a study released by the American Cancer Society. Here's the scary part. The risk of developing an obesity-related cancer is increasing in successively younger people.

"The risk of cancer is increasing in young adults for half of the obesity-related cancers, with the increase steeper in progressively younger ages," said co-author Ahmedin Jemal, who is the vice president of the Surveillance and Health Services Research Program for the American Cancer Society.

Cancers that are typically found in the elderly, colorectal, endometrial, gallbladder, kidney, pancreatic and multiple myeloma, a cancer of the bone marrow, are the ones that showed up in this analysis.

"This study shows the incidence of cancer associated with obesity has been rising dramatically in groups of individuals born in more recent decades," MD Anderson Cancer Center's Dr. George Chang told CNN, who was not associated with the analysis.

Though the study doesn't directly point to obesity as the cause of the cancer, it certainly appears to be a factor.

"The study was not set up to establish causation," Chang said. "We know there are many factors that are associated with both obesity and cancer, such as lack of exercise and poor diet. How much each of those factors contribute to cancer is less clear."

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