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WHITE colour

Participants were identified via the proprietary Growth from Knowledge (GfK, Nuremberg, Germany) consumer online panel KnowledgePanel, which aimed to be representative of the US population

Data analysis Unsupervised principal component analysis (PCA) was first used to observe the overall distribution of samples and the stability of the analysis, followed by supervised partial least-squares discriminant analysis (PLS-DA) and orthogonal partial least-squares discriminant analysis (OPLS-DA) used to distinguish the differences in metabolic profiles