| Summary: | Objective: Few studies have related nutritional factors with quality of life in healthy populations.
Our aim was to analyze the relationship between commercial bakery, fast food or soft drinks consumption
and mental and physical quality of life. Study Design: This analysis included 8335 participants
from the "Seguimiento Universidad de Navarra" (SUN) Project (a multipurpose, dynamic
cohort). Methods: The consumption of commercial bakery, fast food and soft drinks was assessed
through a validated food-frequency questionnaire at baseline. Quality of life was measured after 4
years of follow-up with the Short-Form 36 (SF-36) Health Survey. Generalized Linear Models were
fit to assess the regression coefficients (b) and their 95% confidence intervals (95% CI) for the
association between commercial bakery, fast food and soft drinks consumption and each domain
and the two standardized measures of the SF-36. Results: As compared to the participants in the
lowest quintile of consumption, those participants in the highest quintile of consumption of commercial
bakery, fast food and soft drinks showed a score significantly lower (>2 points) for vitality
(b = −2.14, 95% CI = −3.31 to −0.96), role emotional (b = −2.23, 95% CI = −4.33 to −0.13), and role
physical (b = −2.31, 95% IC = −4.26 to −0.36) domains with statistically significant dose-response
relationships (p for trend < 0.05). When the food groups were analysed separately, significant inverse
associations were found only for commercial bakery and fast-food consumption. Conclusions:
The results suggest that high consumption of commercial bakery, fast-food and soft drinks
at baseline was associated with worse scores on self-perceived quality of life. This association was
stronger for the mental domains of the SF-36.
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