About half are overweight, and around 20% are classified as obese. mbl.is/Ómar ÓskarssonJust over half of the participants in the third data collection of Heilsuferðalagið (The Health Journey) rated their mental and physical health as good or very good at the age of 36. According to a press release, about half of the participants were overweight, and roughly 20% were classified as obese. In total, around 1,000 Icelanders born in 1988 have participated in one or more of the three data collection phases. With approximately 4,700 people born in Iceland that year, about 20% of the entire age group has taken part.