• Dynamic blood glucose changes (average blood glucose) [ Time Frame: week 3,week 4 ]
  Patients will be exposed to a dynamic glycemic transient monitor from the 3rd week of the study period, worn for 2 weeks, and removed at the 4th week of follow-up. During the period of wearing, the patients will be required to record the dietary diary, preprandial and postprandial (every 15 minutes) blood glucose level (mmol/L) for 3-day period (including one day of the weekend)each week, and also select 3 days per week (including one day of the weekend) to record daily exercise, pre- and post-exercise (every 30 minutes) blood glucose levels (mmol/L) .
• Insulin resistance index changes [ Time Frame: Baseline time, week 4 ]
  The patients will be subjected to two blood collections throughout the study, at baseline and at the 4th week of follow-up. The insulin resistance index is calculated as HOMA-IR=［plasma glucose（GLU,mmol/L）*serum insulin(mIU/L)］/22.5.

• Blood glucose control compliance rate [ Time Frame: Baseline time, week 4 ]
  The patients will be subjected to two blood collections throughout the study, at baseline and at the 4th week of follow-up. The glycemic control compliance rate will be compared using two fasting blood glucose values and expressed as a number (percentage).
• Glycated albumin changes [ Time Frame: Baseline time, week 4 ]
  The patients will be subjected to two blood collections throughout the study, at baseline and at the 4th week of follow-up. The change in glycated albumin (GA%) will be compared with the values of two fasting blood samples, with a normal range of 10.8%-17.1%.

• Blood lipid changes [ Time Frame: Baseline time, week 4 ]
  The patients will be subjected to two blood collections throughout the study, at baseline and at the 4th week of follow-up. Changes in blood lipids (total cholesterol, mmol/L;triglycerides, mmol/L;high-density lipoprotein cholesterol, mmol/L; low-density lipoprotein cholesterol, mmol/L) will be compared using the values of two fasting blood samples. The normal range is 2.85-5.70 mmol/L for total cholesterol, 0.45-1.70 mmol/L for triglycerides, 1.42-11.29 mmol/L for high-density lipoprotein cholesterol, and 2.07-3.62 mmol/L for low-density lipoprotein cholesterol.
• BMI changes [ Time Frame: Baseline time, week 2,week 4 ]
  Patients will be subjected to three body weight measurements throughout the study, baseline, week 2, and week 4 of follow-up,along with their height measurements at the start of the study. Both of the height and weight will be measured with a standard instrument and recorded in meters and kilograms respectively，following a requirement of accurating to two decimal places. And the weight and height will be combined to report in a form of BMI in kg/m^2.The changes in BMI before and after the study will be expressed as mean ± SD.

The prevalence of Type 2 Diabetes Mellitus is increasing year by year in the world, causing harm to patients' health and making a huge consumption of medical expenses. Obesity is one of the most obvious risk factors for Type 2 Diabetes Mellitus. There are also many positive studies on nutritional intervention for the treatment of obese patients with Type 2 Diabetes Mellitus at home and abroad. The effect of nutritional meal replacement to relieve the disease has also been widely recognized.

Light-Fat Rice® is a new type of nutritious staple food taking rice, konjac, marine fish oligopeptide powder, inulin and yeast as raw material. Also,there is a protein solid beverage,Active Peptide®,containing soy protein isolate, soy peptide powder, oligofructose,water-soluble dietary fiber and other ingredients,such as multi-vitamin. When used together, it can provide balanced nutrition for the human body while satisfying low fat and high protein. In this study, a 4-week, randomized, double-blind, controlled clinical trial will be conducted to investigate the effects of Light-Fat Rice® combined with Active Peptide® intervention on insulin resistance in overweight/obese diabetic patients and their effects on prognosis,further explaining its intervention mechanism theoretically. Based on a previous review of similar literature studies, 60 of these patients will be enrolled and randomly assigned to the intervention and control groups at 1:1. Among them, the intervention group will be given 80g of Light-Fat Rice® staple food meal as an independent staple food or mixed in the staple food combined with 2 packs Active Peptide®, and the control group was given the same energy-equivalent staple food produced by the same manufacturer daily with 2 packs maltodextrin. Both groups are provided with a same lifestyle guidance by professional physicians based on the "Guidelines for the Prevention and Treatment of Type 2 Diabetes in China 2017", including reasonable diet, exercise guidance, and organization of health education.

• Diabetes Mellitus, Type 2
• Overweight and Obesity

• Dietary Supplement: Light-Fat Rice® combined with Active Peptide®+ lifestyle guidance
  Subjects will be given the Light-Fat Rice® combined with Active Peptide® with a lifestyle guidance to assist diabetes management. The method of taking the product has two parts: 1.Light-Fat Rice®: 80g (1 pack) per day as a staple meal replacement, used as a separate staple food or mixed with other staple foods, taking 4 weeks; 2.Active Peptide®: 20g (2 packs) per day (1 pack each morning and evening), served with 300ml of 40°C warm water each time before meals and take it for 4 weeks.
• Dietary Supplement: A staple food of comparable energy containing a small amount of dietary fiber combined with a comparable energy maltodextrin + lifestyle guidance
  A staple food of comparable energy containing a small amount of dietary fiber combined with a comparable energy maltodextrin (both produced by the same manufacturer) with a lifestyle guidance will be given by the professional to assist in diabetes management. The product is taken as follows: 1.equal-energy staple food containing a small amount of dietary fiber: 80g (1 pack) per day, used as an independent staple food or mixed with other staple foods, taking for 4 weeks; 2.equal-energy maltodextrin: 20g(2 packs) per day(1 pack each morning and evening),take it with 300ml of 40°C warm water for 4 weeks.

• Experimental: Intervention group
  The Light-Fat Rice® group
  Intervention: Dietary Supplement: Light-Fat Rice® combined with Active Peptide®+ lifestyle guidance
• Placebo Comparator: Control group
  The comparable energy staple food group
  Intervention: Dietary Supplement: A staple food of comparable energy containing a small amount of dietary fiber combined with a comparable energy maltodextrin + lifestyle guidance

• Ryan DH, Espeland MA, Foster GD, Haffner SM, Hubbard VS, Johnson KC, Kahn SE, Knowler WC, Yanovski SZ; Look AHEAD Research Group. Look AHEAD (Action for Health in Diabetes): design and methods for a clinical trial of weight loss for the prevention of cardiovascular disease in type 2 diabetes. Control Clin Trials. 2003 Oct;24(5):610-28.
• Leslie WS, Ford I, Sattar N, Hollingsworth KG, Adamson A, Sniehotta FF, McCombie L, Brosnahan N, Ross H, Mathers JC, Peters C, Thom G, Barnes A, Kean S, McIlvenna Y, Rodrigues A, Rehackova L, Zhyzhneuskaya S, Taylor R, Lean ME. The Diabetes Remission Clinical Trial (DiRECT): protocol for a cluster randomised trial. BMC Fam Pract. 2016 Feb 16;17:20. doi: 10.1186/s12875-016-0406-2.
• Lean ME, Leslie WS, Barnes AC, Brosnahan N, Thom G, McCombie L, Peters C, Zhyzhneuskaya S, Al-Mrabeh A, Hollingsworth KG, Rodrigues AM, Rehackova L, Adamson AJ, Sniehotta FF, Mathers JC, Ross HM, McIlvenna Y, Stefanetti R, Trenell M, Welsh P, Kean S, Ford I, McConnachie A, Sattar N, Taylor R. Primary care-led weight management for remission of type 2 diabetes (DiRECT): an open-label, cluster-randomised trial. Lancet. 2018 Feb 10;391(10120):541-551. doi: 10.1016/S0140-6736(17)33102-1. Epub 2017 Dec 5.
• Lean MEJ, Leslie WS, Barnes AC, Brosnahan N, Thom G, McCombie L, Peters C, Zhyzhneuskaya S, Al-Mrabeh A, Hollingsworth KG, Rodrigues AM, Rehackova L, Adamson AJ, Sniehotta FF, Mathers JC, Ross HM, McIlvenna Y, Welsh P, Kean S, Ford I, McConnachie A, Messow CM, Sattar N, Taylor R. Durability of a primary care-led weight-management intervention for remission of type 2 diabetes: 2-year results of the DiRECT open-label, cluster-randomised trial. Lancet Diabetes Endocrinol. 2019 May;7(5):344-355. doi: 10.1016/S2213-8587(19)30068-3. Epub 2019 Mar 6.
• Laws R; Counterweight Project Team. A new evidence-based model for weight management in primary care: the Counterweight Programme. J Hum Nutr Diet. 2004 Jun;17(3):191-208.

Inclusion Criteria:

1. Comply with the diagnostic criteria for type 2 diabetes in the 1999 WHO Diabetes Diagnosis and Classification Standard:

   Clear clinical record of fasting blood glucose (FPG) ≥ 7mmol / L or 75g OGTT（2h） ≥ 11.1mmol / L;

2. T2DM of duration > 1 year（diagnosis based on the 1999 WHO Diabetes Diagnosis and Classification Standard in China ）;
3. Body mass index: 25 kg/m2 < BMI ≤ 35kg/m2;
4. Men and women aged 18-75 years;
5. Volunteer to participate in the trial and sign the informed consent form .

Exclusion Criteria:

1. Acute cardiovascular and cerebrovascular events or myocardial infarction within previous 6 months;

2. Laboratory inspection:

   Liver function: AST and / or ALT ≥ 2.5 × ULN; Renal function: Cr>1.2×ULN;

3. People with severe gastrointestinal diseases, such as active peptic ulcer, intestinal obstruction, etc.;have a history of changes in the normal structure of the gastrointestinal tract;
4. Hypertensive patients with poor blood pressure control(blood pressure SBP≥160mmHg and / or DBP≥100mmHg);
5. Those with severe blood system diseases;
6. Combine other endocrine system diseases(such as hyperthyroidism or hypercortisolism);
7. Patients with stress or secondary blood glucose elevation(such as taking glucocorticoids);
8. Pregnant or lactating women,and women who are not willing to contraception during pregnancy or study;
9. Food or other drug abusers;
10. People who may be allergic to the test food;
11. Those who have participated in other food trials within 3 months;
12. Those who cannot co-operate with mental illness;
13. Other circumstances,which the researcher believes that it is not suitable for the group.