The COVID-19 lockdown as an opportunity to change lifestyle and body weight in people with overweight/obesity and diabetes: Results from the national French COVIDIAB cohort

•The lockdown was associated with an opportunity to change weight/lifestyle in patients with diabetes and overweight/obesity.•Weight gain was observed in 29% of overweight/obese patients with type 2 diabetes.•19% of overweight/obese patients with type 2 diabetes took advantage of the lockdown to lose weight.•Smoking cessation was more prevalent in patients who lost weight as compared to patients with weight gain or stable weight.