Web- or internet-based programs have the potential to induce and, possibly, help to sustain, significant lifestyle modification. This study will evaluate the effect of a unique interactive web-based behaviour change program on weight loss and cardiovascular risk factors in people who are overweight or obese and at high risk of cardiovascular disease.

Inclusion Criteria:

• Over 18 years old
• Have regular access to the internet, telephone and have an e-mail address.
• Body mass index (BMI) greater than 27 and less than 40
• Sedentary
• Have one or more of the following risk factors associated with cardiovascular disease: Elevated blood pressure ≥ 140 mm Hg systolic or ≥ 90 mm Hg diastolic; Elevated total cholesterol ≥ 5.0; Type 2 diabetes
• Be willing to refrain from participating in another behaviour change program for the duration of the study

Exclusion Criteria:

• Major health problems including Type 1 diabetes, established CVD, renal and hepatic disease
• Psychiatric problems
• Pregnancy
• Excessive alcohol consumption