Obesity has been linked to an increased risk of various types of cancer, including breast cancer, colon cancer, and pancreatic cancer. The American Cancer Society has published guidelines on nutrition and physical activity, which highlight the importance of maintaining a healthy weight to reduce the risk of cancer. A person's body mass index (BMI) is used to determine whether they are at a healthy weight, with a BMI of 18.5-23.9 considered normal, 24-27.9 considered overweight, and 30 or higher considered obese. Research has shown that excess calorie intake can lead to obesity, which can increase the risk of cancer. For example, a study found that women who were obese before menopause had a higher risk of developing colon cancer than those who were not obese. Another study found that obese individuals had a higher risk of developing pancreatic cancer. In addition to increasing the risk of cancer, obesity can also increase the risk of other health problems, such as heart disease and stroke. Therefore, it is essential to maintain a healthy weight through a combination of a balanced diet and regular physical activity.