Recent studies have shown that alcohol consumption and obesity are both detrimental factors in the treatment of breast cancer. BMI (Body Mass Index, also known as Body Mass Index, or BMI) is a number derived by dividing body weight in kilograms by height in meters squared. Body Mass Index (BMI) = weight (kg)/height (m) squared. BMI values for adults Body mass index, male, female Underweight, below 20, below 19 Moderate, 20-25, 19-24 Overweight, 26-30, 25-29 Obese, 30-35, 29-34 Very obese, above 35, above 34 Experts say the ideal body mass index is 22 . Breast cancer patients with a BMI >25 have a 42-46% increased risk of distant metastases over 10 years Breast cancer patients with a BMI >25 have a 26-38% increased chance of dying from breast cancer Breast cancer patients with a BMI >30 are less sensitive to adjuvant therapy Small amounts of alcohol do not increase the risk of local recurrence and distant metastasis of breast cancer, but excessive alcohol consumption (>6g/day) increases the risk of local recurrence and distant metastasis of breast cancer, especially for obese and postmenopausal breast cancer patients. Therefore, it is beneficial for breast cancer patients to abstain from alcohol and lose weight in addition to receiving conventional treatment.