 Both diets will have the same energy content and will be isocaloric aiming to keep participants weight stable during the study period. Their energy content will be tailored to participants total energy expenditure and physical activity level calculated by the WHO set of equations. The order of the diets will be randomly allocated using an MS Excel command. In order to minimize fatigue with the diet but also to ensure that we will be able to detect changes in gut microbiota, experimental diets will be given for 7 days. This is based on recent evidence suggesting that dietary changes for 5 days induce reproducible alterations in gut microbiota composition and metabolism. Prior to the first diet intervention, participants will also record their dietary intake using a 7-day estimated food diary. Between the two interventions the participants will have to eat their habitual diet for two weeks and this will be a wash out period which aims to drive the gut microbiota back to baseline levels. The week prior to the initiation of the second intervention the participants will be asked to keep the same dietary pattern as they had the week prior to the first trial. 