People who maintain a body mass index of 25 kg/m² or higher over a two-year period have a 9% higher risk of developing colorectal cancer before age 50 compared to those who maintain a non-obese weight.

Adults who maintain a large waist size over a two-year period have an 18% higher risk of developing colorectal cancer before age 50 compared to those who do not have persistent abdominal obesity.

People who consistently have excess body weight and excess fat around the abdomen have a 19% higher chance of developing colorectal cancer before age 50 compared to people who maintain a normal weight and no abdominal fat accumulation.

People who have been overweight or obese for many years have a higher risk of developing colorectal cancer than those whose weight changed recently, with the highest risk linked to weight measured 8 to 12 years before diagnosis.

Asian adults with a BMI above 30 have a 32% higher chance of developing colorectal cancer than those with a BMI between 23.0 and 25.0, based on long-term population data.

People who had a high body mass index (BMI) 8 to 12 years before being diagnosed with colorectal cancer were more than twice as likely to develop the disease compared to those with a normal BMI, suggesting that carrying excess weight over a long period increases risk, even if weight drops shortly before diagnosis.