The purpose of this study is to find out if learning about healthy eating can help people with diabetes control their blood sugar better. This study is for men and women between 16 and 70 years old who currently use only oral-diabetic medications or in combination with basal insulin but their glycemia have not been in the target range. The investigators want to answer the following questions: Can nutrition education help lower HbA1c (a blood test that shows average blood sugar over the past 3 months)? Can it improve nutrition related knowledge, attitude and behaviors among patients with type 2 diabetes? Will it help reduce fasting blood sugar, lipid levels, body weight, and the number of times low blood sugar (hypoglycemia) happens? Participants will be divided into two groups: One group will receive a nutrition booklet. The other group will receive the same booklet and join four monthly lessons with a researcher. The four lessons will talk about: Goals for managing diabetes Main nutrients in food and their effects on glycemia How to plan meals How to eat in a way that supports better blood sugar control
Inclusion Criteria: * People between 16 and 70 years old. * People who come to Cho Ray Hospital for diabetes care and plan to keep getting care there for at least six months. * People who have diabetes and have been prescribed diabetes medicine. * People who were recently diagnosed with diabetes, based on the latest guidelines from the American Diabetes Association. * People whose blood sugar (HbA1c) level is higher than 7.5 %. * People who are currently using only oral anti-diabetic medications or in combination with basal insulin Exclusion Criteria: * People who are seriously ill and need to stay in the hospital, such as those with infections, pneumonia, heart attacks, strokes, or infected diabetic foot. * People who have cancer, serious mental health problems, or problems with drug use. * People who do not want to take part or cannot follow the study plan.