The primary aim of this study is to is to determine if a diet (TCM-FMD) which combine fasting-mimicking diet (FMD) with "dispelling dampness" meal replacement (a meal replacement made up of traditional Chinese medicine) is the effective dietary strategy for treatment of phlegm-dampness type overweight/obese patients. A three months randomized trial will be used to observe weight loss generated by TCM-FMD and FMD. And a group keeping a normal diet will be set as a blank control. Through comparison, we aim at examining the effects of interventions on weight and metabolic disease risk factors (plasma lipids, fasting glucose, blood pressure) The secondary aim of this study is to evaluate the safety of TCM-FMD.

Background:Fasting-mimiking Diet (FMD) is a plant-based diet designed to attain fasting-like effect, firstly proposed on 2015[1]. It requires people to limit calorie intake for 5 continuous days, and then return to their normal diet after completion about 25 days until the next cycle. In a clinical trial[2], three FMD cycles reduced body weight, trunk and body fat, and reduced blood pressure, fasting blood glucose, triglycerides and total cholesterol. On the other hand, in the theory of physique of TCM theory, overweight/obesity is usually considered to be phlegm-dampness type.

Objective: We assume that using medicinal-edible plants which was considered to dispel dampness(such as fuling, shanyao, etc.) as FMD's proprietary formulations can enhance the effect of FMD on improve people's characteristic features of metabolic syndrome.

Methods: A 12-week, single-center, pilot study will be conducted to test the study objectives.A new diet is carried. It is a fasting-mimicking diet combined with a "dispelling dampness" meal replacement. Because the theory of applying traditional Chinese medicine combined with FMD, we call it TCM-FMD, the main ingredient of the "wet diet" meal package is millet. Brown rice, oats, purple sweet potato, alfalfa, yam, hazelnut, etc. For comparison, we also designed FMD to make some cereals (including millet, purple potato, oatmeal, walnut, etc.) without a moisturizing effect into a "grain package" as a control group. Both groups were administered using the FMD diet model. At the same time, a group of normal diets was also designed as a blank control group. The primary outcome measure for the study was weight; secondary outcome measures included: waist circumference, blood pressure, triglycerides, total cholesterol and fasting blood glucose, quality of life (evaluated by physical fitness scale and SF-36); safety indicators included: liver and kidney Features, etc. Both groups were subjected to caloric restriction (5 days, daily calorie about 800kcal) and normal diet (dietitian for healthy diet guidance), and the blank control group was given a normal diet.

Inclusion Criteria:

• Diagnosed as overweight / obesity according to the "China Adult Obesity Prevention and Treatment Expert Consensus"
• Diagnosis as phlegm-dampness type according to the "Traditional Chinese Medicine Classification and Judgment" scale published by the Chinese Medicine Association
• 18 years old ≤ age ≤ 65 years old
• Signed the informed consent

Exclusion Criteria:

• Those who have special food requirements or having a history of food allergies
• Those who have history of previous diabetes, or body weight loss, BMI ≤ 18
• Those who have had cardiovascular and cerebrovascular events within half a year, or who have a major history of surgery
• Pregnant or lactating woman
• Those who have severe primary diseases such as liver or kidney diseases, as well as abnormalities in the hematopoietic system and mental disorders
• Those who need to take special drugs (such as hormones)
• Those who refuse to provide information required for research (such as personal information, blood samples, etc.)