Online (web-based) delivery of personalised dietary, weight and physical activity advice based on the individual's dietary intake, weight and physical activity levels, generated by the e-Nutri web application. Participants in this group will receive online personalised reports.

Face-to-face delivery of personalised dietary, weight and physical activity advice based on the individual's dietary intake, weight and physical activity levels, generated by the e-Nutri web application. Participants in this group will receive nutritional advice face-to-face (in person or via video chat).

Non-personalised advice Control group. Online (web-based) delivery of non- personalised dietary, weight and physical activity advice based on the UK general health guidelines. This arm will be using the e-Nutri web application. Participants in this group will receive online general recommendations (non- personalised).

Provision of online non-personalised advice on dietary intake, weight and physical activity levels. Non-personalised dietary advice for improved food choice based on standard population health guidelines.

Change from baseline in dietary intake at 6 and 12 weeks assessed via a Food Frequency Questionnaire (FFQ). An 11-item modified US Alternative Healthy Eating Index (m-AHEI), which is calculated from the results of the FFQ, will be used to quantify the dietary intake changes.

Change from baseline in self-reported weight (kg) at 6 and 12 weeks. Weight variation will be combined with height (constant for adults) and also reported as BMI variation (kg/mˆ2).