Does an education intervention on taste qualities, taste test performance, and scale use modify the taste perception score and taste preferences?

INTERVENTION: Intensive educational intervention in the intervention group consisting of group and individual intervention on taste qualities, taste function, taste perception, taste tests, types of taste perception scales and taste preference scales. In the control group a minimal explanation of the performance of taste perception test, scales and preferences will be carried out. In both groups taste perception tests will be carried out with the same tastants and concentrations as well as with the same scales (categorical versus Labeled Magnitude Scale) will be undertaken. The tastants and concentration will be as follows: Each tastant wil be presented to subjects independently. Five series of concentrations (concentrations I, II, III, IV and V, respectively) will be used for bitter, sweet, salty, sour and umami. Six representative tastants (two tastants for bitter and one tastant for the other tastes) will be used: for PROP and PTC (0.055, 0.17, 0.55, 1.7, and 5.5 mM); for sucrose (100 mM, 150 mM, 200 mM, 300 mM and 400 mM), for NaCl (25 mM, 50 mM, 75 mM, 100 mM and 200 mM); for citric acid (1 mM, 5 mM, 10 mM, 17mM and 34 mM) and for MPG (25 mM, 50 mM, 75 mM, 100 mM and 200 mM). CONDITION: Taste perception ; Digestive System PRIMARY OUTCOME: ; 1. Taste perception (for individual tastes and the total taste score) at baseline and after 1‐3 weeks; 2. Body mass index (BMI) at baseline and after 1‐3 weeks; SECONDARY OUTCOME: ; 1. Taste preferences at baseline and after 1‐3 weeks; 2. Adherence to the Mediterranean diet measured by the 14‐item Mediterranean diet adherence PREDIMED scale at baseline; 3. Physical activity measured by the Minnesota physical activity questionnaire at baseline; 4. Sleep quality measured by the Pittsburgh Sleep Quality Index at baseline; 5. Chronotype assessed using the Horne and Östberg morningness–eveningness questionnaire (MEQ) at baseline; INCLUSION CRITERIA: 1. Volunteers recruited from the general population 2. Both sexes 3. Between 18 and 80 years old