Research has found that diet, weight, fat, and obesity are far more associated with cancer than people thought. The role of fat in cancer is multifaceted, one of which is that excess fat affects the body’s hormone balance. In women, fat cells have been found to release estrogen, which increases the risk of breast cancer in obese individuals. The scientific method for evaluating obesity is the BMI index, which is the weight (kg) divided by the square of the height (m). The body mass index of a normal-sized person generally ranges from 18.5 to 24.9. A study that combined 31 studies with more than 70,000 respondents found that the risk of colorectal cancer in obese individuals (BMI ≥ 30 kg/m2) was 1.19 times higher than that in normal-weight individuals (BMI < 25 kg/m2), and the risk in highly obese patients rose to 1.49 times, with this increased risk being more pronounced in men. Meanwhile, the risk of colorectal cancer increased by 7% for every 2 kg/m2 increase in BMI, and by 4% for every 2 cm increase in waist circumference. Meanwhile, a study published in a top oncology journal said that obese colorectal cancer patients have a poorer prognosis compared to normal-weight individuals. dMMR (defective mismatch repair) delays the progression of colorectal cancer, and the study found that the probability of dMMR was significantly lower in obese (10.3%) than in normal-weight patients (17.4%), and the incidence of dMMR was lower in obese men than in women. The 5-year recurrence rate and overall recurrence rate were significantly higher in obese patients than in normal-weight patients, and both the time to recurrence and tumor-free survival were shorter in obese patients than in normal-weight patients. It can be seen that obesity not only increases the incidence of colorectal cancer, but also accelerates the progress of tumor after it appears. Suggestions: 1. Drink alcohol in moderation. If people want to drink alcohol, it is better to control two units per day for men and one unit per day for women. One unit means half a pint (about 0.286 liters) of beer or a small glass of wine. 2. Eat less salt. Experts recommend that each person should not exceed one teaspoon of salt per day, eat more vegetables and fruits, drink more water rather than more sugary drinks, and strive to take in nutrients from food, rather than relying on nutritional products. 3, eat less red meat. Experts recommend that each person's weekly intake of red meat is best within 500 grams. Red meat refers to uncooked before showing red meat, mostly belonging to mammals, such as pigs, sheep, beef, etc.. Poultry, fish and shrimp are not included in this list. In addition, studies have found that consuming large amounts of "processed meat" can increase the risk of rectal cancer. "Processed meat" refers specifically to bacon, bacon, ham and other foods.