Introduction:
Non-communicable diseases (NCDs) are the important cause of morbidity and mortality in Thailand. To control the diseases, medical treatment and lifestyle modifications are indicated. However, the effectiveness of lifestyle modification programs is still not clearly revealed.

Objectives:
To study the effectiveness of health-risk behavior modification programs, called “Change4Health” on health outcomes.

Methods:
Health-risk behavior modification programs, called “Change4Health”, was developed to change unhealthy habits, using mnemonic, including A-Avoid alcohol, B-Body movement, C-Cessation, D-Diet. Each behavior carries simplified techniques to make them easy to follow. Workshops were held and materials were given to participants. A total of 1815 participants from 20 primary care units in Bangkok were recruited. Modification of health risk behaviors were followed up at 1 and 3 months at the pilot phase. In addition, other outcomes including body weight, waist circumference, blood pressure, Dextrostix and LDL level were recorded.

Results:
After participating in the “Change4Health”programs, 45%, 47.8%, 11.8% and 15.8 % of participants can stop smoking, changed their eating behavior, doing more exercise and reduce alcoholic consumption, respectively. 31.3% of participants can reduce their body weight. 16.3% was able to cut down their waist circumference. These outcomes were associated with eating behavior, and smoking cessation (p-value < 0.01). Blood pressure decreased by 15.3 %, which was associated with smoking cessation and exercise. Dextrostix decreased by 55.2 %, which was associated with eating behavior. LDL level decreased by 31.5%, and was associated with eating behavior and smoking cessation (p-value < 0.01).

Conclusion(s):
Implementing health-risk behavior modification programs, such as, “Change4Health” in the primary care unit settings is effective in promoting health, although smoking cessation and changing diet appeared to be mostly effective.