Only participants aged 18 years of age and above will be included in the study. A minimal set of exclusion criteria will be applied (subject under 18 years old, pregnant or lactating, no or limited access to internet, following a prescribed diet for any reason, including weight loss in the last 3 months, Insulin dependent diabetes, celiac disease, Crohn's, or any metabolic disease or condition that alters nutritional requirements, such as diabetes. Other than balancing the male to female ratio among recruits (with not more than a 70/30 or 30/70 distribution of males and females in each group) and balancing the age ratio (with not more than a 70/30 or 30/70 distribution of participants <45 years and > 45 years old in each group) no other stratification will be applied since the objective is to complete the proof-of-principle study in as real setting as possible. All age and sex stratification will be applied before randomisation of the participants to each level / group of personalised nutrition (0, 1, 2 and 3).