The Impact of Lifestyle Intervention on Weight and Fertility in Obese Males

Inclusion Criteria: 1. Male, aged 22-40 years. 2. BMI≥30 kg/m² (defined as obesity according to WHO standards). 3. Patients who are willing and able to provide informed consent and follow all study procedures, including ongoing visits to the Reproductive Center of the Third Affiliated Hospital of Zhengzhou University and undergoing relevant tests 4. Spouse aged 20-40 years, with menstrual regularity (menstrual cycle length of 21-35days, duration of 2-7days), with a BMI of 18.5≤BMI \< 25 kg/m², planning for ART treatment at our center due to male factor infertility. 5. Not participating in any other research projects currently or in the preceding three months. 6. Willing to allow offspring conceived through the study to participate in follow-up research. Exclusion Criteria: 1. Male reproductive urinary system abnormalities: active urinary reproductive system infections; hypogonadism; hyperprolactinemia; excessive estrogen; cryptorchidism, etc.; 2. Acute and chronic diseases that may affect fertility: chronic systemic diseases; history of systemic cytotoxic therapy or pelvic radiotherapy; other acute diseases that may affect study results; 3. Digestive system and metabolic abnormalities: acute and chronic digestive system diseases affecting digestive absorption function; history of or current eating disorders; allergies to ingredients in meal replacement products; gout, kidney stones, or gallstones; history of weight loss surgery; 4. Unhealthy lifestyle habits: meeting at least one of the following conditions: heavy alcohol consumption, daily smoking, history of drug abuse, history of substance abuse; 5. Personal factors affecting trial participation: impaired capacity to fully consent to participation in the study; major mental disorders; occupations requiring intense physical exercise; current diets that may interfere with the dietary plans of this study; exclusion of current or past use of hormones or anti-obesity drugs, or the use of other medications that affect hormone levels, carbohydrate metabolism, or appetite.