Findings from an online behavioural weight management programme provided with or without a fortified diet beverage

The present multi-centre randomised weight-loss trial evaluated the efficacy of a low-intensity 12-week online behavioural modification programme, with or without a fortified diet beverage using a 2x2 factorial design. A total of 572 participants were randomised to: (1) an online basic lifestyle information (OBLI) intervention, consisting of one online informational class about tips for weight management; (2) an online behavioural weight management (OBWM) intervention, entailing 12 weekly online classes focused on weight-loss behaviour modification; (3) an OBLI intervention plus a fortified diet cola beverage (BEV) containing green tea extract (total catechin 167mg), soluble fibre dextrin (10g) and caffeine (100mg) (OBLI+BEV); (4) OBWM+BEV. Assessments included height, weight, dual-energy X-ray absorptiometry-derived body composition, and waist circumference (WC). Attrition was 15 center dot 7%. Intention-to-treat (ITT) models demonstrated a main effect for type of Internet programme, with those assigned to the OBWM condition losing significantly more weight (F=7 center dot 174; P=0 center dot 008) and fat mass (F=4 center dot 491; P=0 center dot 035) than those assigned to the OBLI condition. However, there was no significant main effect for the OBWM condition on body fat percentage (F=2 center dot 906; P=0 center dot 089) or WC (F=3 center dot 351; P=0 center dot 068), and no significant main effect for beverage use or significant interactions between factors in ITT models. A 12-week, low-intensity behaviourally based online programme produced a greater weight loss than a basic information website. The addition of a fortified diet beverage had no additional impact.