As a new part of the study, we would like to understand the impact of the Low Calorie Diet (LCD) Programme in people with joint pain. However, you will be able to take part even if you do not have joint pain. This is so that we can look at differences between people with and people without joint pain. In this part of the study, we would like to collect some additional questionnaire data and blood samples from people who have just started taking part in the LCD programme.