Doctors have uncovered a key reason behind the alarming rise in bowel, colon, and other obesity-related cancers among younger people — and it’s linked to growing waistlines. A major U.S. study found deaths from obesity-linked cancers have nearly tripled in the past two decades.

Researchers say the number of deaths rose from 3.7 to 13.5 per million since the late 1990s. “This is a wake-up call,” said Dr. Faizan Ahmed from New Jersey’s Hackensack Meridian University. “We need stronger public health action — better screening, prevention, and care for at-risk communities.”

Obesity increases the risk of at least 13 cancers, including bowel, breast, liver, pancreas, and kidney cancer. Too much body fat can trigger inflammation and hormonal changes, causing cells to divide faster — a key step in cancer growth. Experts warn that even small weight gains raise the risk, especially in men.

While obesity explains many cases, doctors are also investigating other factors — from chemicals and microplastics to modern diets. “It’s not just about appearance,” one expert noted. “Excess weight can quietly shape our long-term health.” The message is clear: tackling obesity today could save thousands of lives tomorrow.