Table 1. Mediterranean diet used in the intervention arm of the PREDIMED-PLUS trial: 17-point questionnaire to assess adherence.

Questions	Criteria for 1 point
Do you use only extra-virgin olive oil for cooking, salad dressings, and spreads?	Yes
How many fruit units (including natural fruit juices) do you consume per day?	≥3
How many servings of vegetables/garden produce do you consume per day? [1 serving: 200 g (consider side dishes as half a serving)]	≥2 (≥1 portion raw or in a salad)
How many servings of white bread do you consume per day? (1 serving: 75 g)	≤1
How many times per week do you consume whole grain cereals and pasta?	≥5
How many servings of red meat, hamburgers, or meat products (ham, sausage, etc.) do you consume per week? (1 serving: 100–150 g)	≤1
How many servings of butter, margarine, or cream do you consume per week? (1 serving: 12 g)	<1
How many sugary beverages or sugar-sweetened fruit juices do you drink per week?	<1
How many servings of legumes do you consume per week? (1 serving: 150 g)	≥3
How many servings of fish or shellfish do you consume per week? (1 serving: 100–150 g of fish or 4–5 units or 200 g of shellfish)	≥3
How many times per week do you consume commercial sweets or pastries (not homemade), such as cakes, cookies, sponge cake, or custard?	<3
How many servings of nuts (including peanuts) do you consume per week? (1 serving: 30 g)	≥3
Do you preferentially consume chicken, turkey or rabbit instead of beef, pork hamburgers or sausages?	Yes
How many times per week do you consume vegetables, pasta, rice or other dishes seasoned with sofrito (sauce made with tomato and onion, leek or garlic and simmered in olive oil)?	≥2
Do you preferentially add non-caloric artificial sweeteners to beverages (such as coffee or tea) instead of sugar?	Yes
How many times per week do you consume non-whole grain pasta or white rice?	<3
How many glasses of wine do you drink per day? (1 glass: 100 ml)	2–3 for men 1–2 for women