Evidence section
Lifestyle programs, dietitians and diabetes prevention
Two pharmacists registered and practising in British Columbia read this page against the study pages and papers it lists and signed it. Their names are withheld from the site and held on file; their registration is confirmed on request.
Medicines are only part of weight management. This hub covers the large studies of structured lifestyle programs: the Diabetes Prevention Program and its twenty-year follow-up, Look AHEAD in people with type 2 diabetes, DiRECT and DIADEM-I on diabetes remission with low-calorie diets, and reviews of dietitian-led care and behavioural programs. Many of these studies are publicly funded and run for longer than any medicine trial.
Studies in this section (13)
Diabetes Prevention Program: lifestyle change versus metformin
The 2002 Diabetes Prevention Program found lifestyle change cut new type 2 diabetes by 58% and metformin by 31% over 2.8 years. A Canadian explainer.
Look AHEAD at one year: lifestyle support in type 2 diabetes
Look AHEAD one-year results explained for Canadian readers: intensive lifestyle support and weight loss in adults with type 2 diabetes.
Look AHEAD at four years: weight, fitness and heart risk factors
Look AHEAD four-year results for Canadian readers: average weight loss, fitness and heart risk factors with intensive lifestyle support in type 2 diabetes.
Can weight-loss surgery prevent type 2 diabetes? The SOS study
The Swedish Obese Subjects study on bariatric surgery and type 2 diabetes prevention, explained in plain language for Canadian readers, with its limits.
Look AHEAD at eight years: how much weight stayed off?
Look AHEAD eight-year results for Canadian readers: 4.7% average weight loss with intensive lifestyle support versus 2.1% with education in diabetes.
Diabetes Prevention Program: what 15 years of follow-up showed
The Diabetes Prevention Program 15-year follow-up explained for Canadian readers: lifestyle change and metformin still lowered new diabetes, with limits.
DiRECT trial: can type 2 diabetes go into remission in one year?
The DiRECT trial explained for Canadian readers: 46% of adults on a primary-care weight-management program reached type 2 diabetes remission at one year.
What a large evidence review found about weight-loss programs
A 2018 review of 122 trials found behavioural weight-loss programs led to 2.39 kg more weight loss than control. Explained for Canadian readers.
DiRECT at two years: did type 2 diabetes remission last?
DiRECT two-year results explained for Canadian readers: 36% of adults on a primary-care weight-management program were still in type 2 diabetes remission.
DIADEM-I: intensive lifestyle change in early type 2 diabetes
DIADEM-I explained for Canadian readers: younger adults with early type 2 diabetes lost 11.98 kg with intensive lifestyle support; 61% reached remission.
Diabetes Prevention Program: heart outcomes after 21 years
After 21 years, the Diabetes Prevention Program found no fewer heart attacks or strokes with lifestyle change or metformin. Explained for Canadians.
Does seeing a dietitian help with weight? A review of 62 trials
A review of 62 randomized trials found dietitian-led weight management led to 4.01% more weight loss than usual care. Explained for Canadian readers.
What role did dietitians play in GLP-1 weight-loss trials?
A 2025 review asked how dietitians were involved in GLP-1 weight-loss trials and found the support poorly described. Explained for Canadian readers.
Other evidence sections
How to read these pages
Every page in this section explains one published study. The numbers are reported as the researchers published them, with a link to the paper on PubMed. Pages say what a study cannot tell you and never rank one medicine against another. They are education, not medical advice. For how a medicine is used and paid for in Canada, see medicines, public drug coverage by province and compare services.
Reviewed and signed by two pharmacists registered in British Columbia, 2026-09-18.