A food frequency questionnaire (FFQ) and carotenoid database with information on a-and bcarotene, lutein, lycopene and b-cryptoxanthin was prepared and used to compare the carotenoid intakes in five European countries: UK, Republic of Ireland, Spain, France and The Netherlands. Eighty, age-(25±45 years) and sex-matched volunteers were recruited in each of the five countries. A FFQ and carotenoid database was prepared of the most commonly consumed carotenoid rich foods in the participating countries and the information was used to calculate frequency and intake of carotenoid-rich foods. The median total carotenoid intake based on the sum of the five carotenoids, was significantly higher P , 0´05 in France (16´1 mg/day) and lower in Spain (9´5 mg/day,) than the other countries, where the average intake was approximately 14 mg/day. Comparison of dietary source of carotenoids showed that carrots were the major source of b-carotene in all countries except Spain where spinach was most important. Likewise, carrots were also the main source of a-carotene. Tomato or tomato products, were the major source of lycopene. Lutein was mainly obtained from peas in Republic of Ireland and the UK, however, spinach was found to be the major source in other countries. In all countries, bcryptoxanthin was primarily obtained from citrus fruit. Comparing the data with that from specific European country studies suggests that the FFQ and carotenoid database described in the present paper can be used for comparative dietary intake studies within Europe. The results show that within Europe there are differences in the specific intake of some carotenoids which are related to different foods consumed by people in different countries.Carotenoids: Food frequency questionnaire: Diet

Objective: To determine dietary carotenoid concentrations using an established and newly developed food frequency questionnaire (FFQ) method, to determine plasma carotenoid concentrations and to determine the relationship between these dietary and plasma variables in 24 ± 45 y and 65 y groups. Design: Descriptive assessment of (FFQ), 7 ± d estimated records, and plasma carotenoids and their relationships in 24 ± 45 y and 65 y groups. Setting: Free living urban adults in Ireland. Subjects: Sixty-four volunteers aged 24 ± 45 y and 54 volunteers aged 65 y. Results: b-carotene was the predominant plasma carotenoid, but older groups had lower plasma concentrations of several carotenoids compared to younger groups (P`0.005). b-carotene and lycopene were the major dietary carotenoids reported by estimated records and FFQ. Several estimated record and plasma carotenoid concentrations were positively associated in younger groups but not in older groups. FFQ overestimated dietary carotenoids relative to estimated records (P 0.05), generally did not re¯ect estimated record carotenoid concentrations and showed positive associations with plasma carotenoids only in older men. Neither of the dietary methods revealed a positive association between plasma and dietary b-carotene concentrations, whereas b-cryptoxanthin was strongly associated. Conclusions: Dietary and plasma concentrations of individual carotenoids are documented in young and elderly groups of a European country. Estimated record data reveals positive associations between diet and plasma carotenoids in younger, but not elderly groups. Further work examining diet-plasma relationship in older groups and developing a common FFQ suitable for use in several European countries is required. Sponsorship: Commission of the European Communities: AAIR Project (AIR2-CT93-0888).

Summary Background: The successful incorporation of fish oil into foods may provide a means of increasing intakes of n‐3 polyunsaturated fatty acids (n‐3 PUFA). The aim of the present study was to evaluate the bioavailability of n‐3 PUFA in microencapsulatd fish oil compared with a fish oil capsule. Methods: Twenty‐eight healthy volunteers were recruited to take part in this randomized controlled trial. Volunteers were supplemented with 0.9 g n‐3 PUFA daily for 4 weeks, delivered either as microencapsulated fish oil in a milkshake or as a fish oil capsule. Plasma fatty acid composition and plasma total cholesterol levels were measured at baseline and after supplementation. In addition, volunteers completed a questionnaire on fish consumption, use of supplements and exercise. Results: Responses to the questionnaire indicated that the males who took part in this study took more physical exercise, consumed less fish and were less likely than the females to take supplements. Plasma n‐3 PUFA concentrations were raised significantly and by a similar level by both fish oil supplements. Furthermore, no significant difference was observed in plasma n‐3 PUFA concentrations following supplementation with either form of fish oil. Plasma total cholesterol levels were not significantly altered by n‐3 PUFA supplementation in either group. The results of this study indicated that there was no difference in the bioavailability of n‐3 PUFA given as microencapsulated fish oil compared with n‐3 PUFA delivered as a fish oil capsule. Fortification of foodstuffs with microencapsulated fish oil therefore offers the potential to increase intakes of n‐3 PUFA in line with current recommendations.

The objective of the present study was to evaluate the oxidative susceptibility of LDL in human volunteers following supplementation with various low doses (<1 g/d) ofn–3 polyunsaturated fatty acids (PUFA). Sixty-two healthy volunteers (thirty-seven males and twenty-five females, aged 19–63 years) were recruited to take part in a randomised placebo-controlled trial. Volunteers were required to take 0.9, 0.6 or 0.3 gn–3 PUFA as fish oil or placebo capsules daily for 16 weeks. Susceptibility of LDL to oxidative modification was assessed by measuring the production of conjugated dienes and thiobarbituric acid-reactive substances in LDL oxidised by Cu2+(15 μM) OR 2,2″-AZOBIS(2-AMIDINOPROPANE) DIHYDROCHLORIDE (1 Mm) for 5 h. Plasma fatty acid and LDL-fatty acid composition, cholesterol levels and antioxidant concentrations were also measured. While post-treatmentn–3 PUFA compositions of plasma and LDL reflected the capsule contents, no meaningful differences in antioxidant concentrations or cholesterol levels were observed between the groups. Supplementation with low doses ofn–3 PUFA as fish oil did not influence the oxidative susceptibility of LDL. The results of the present study suggest that moderate dietary intakes ofn–3 PUFA do not significantly influence the susceptibility of LDL to oxidative modificationin vitro.

The results of this study suggest that, in unsupplemented individuals, plasma can act as a biomarker of carotenoid and gamma-tocopherol concentrations in both LDL and HDL. Supplementation with carotenes or lycopene do not reduce or delay oxidation of LDL. These results support the assumption that carotenoids, such as beta-carotene and lycopene, may show protective effects because they are good markers of fruit and vegetable intake.