Participants and the design of the trial
hypertensive, diabetes, gastrointestinal disease, allergies
CARDIOVASCULAR DISEASE, ALLERGIES
Previously untreated mildly hypertensive men and women (45‐77 years) living in Southwestern Finland were screened from individuals, who had earlier participated in a national FINRISK 2007 health survey [The subject could be included in the study if mean resting systolic blood pressure was 140–160 mmHg or a diastolic blood pressure was 90–100 mmHg. The participants filled in questionnaires for medical history. Individuals who were vegetarians or smoked, or with regular medication or vitamin use, cardiovascular disease, diabetes, gastrointestinal disease, fish allergies, a body mass index higher than 35 kg/mParticipants included in the study first entered a 1‐week period during which they practiced maintaining a low sodium diet with a goal of 5 grams of salt per day (Figure The study flow chart (CONSORT 2010) is given in Figure 