Conflict of interest: V. Connor reports grants from Unilever, during the conduct of the study; the study was part-funded by Unilever, who participated in the study design. The conduct of the study, analysis and presentation of results, and decision to publish were solely determined by the authors, without influence from any funding source. Conflict of interest: E. German reports grants from Unilever and Medical Research Council, during the conduct of the study. Conflict of interest: S. Pojar reports grants from Unilever and MRC, during the conduct of the study. Conflict of interest: E. Mitsi has nothing to disclose. Conflict of interest: C. Hales reports grants from Unilever, during the conduct of the study; the study was part-funded by Unilever, who participated in the study design. The conduct of the study, analysis and presentation of results, and decision to publish were solely determined by the authors, without influence from any funding source. Conflict of interest: E. Nikolaou has nothing to disclose. Conflict of interest: A. Hyder-Wright reports grants from Unilever, during the conduct of the study; the study was part-funded by Unilever, who participated in the study design. The conduct of the study, analysis and presentation of results, and decision to publish were solely determined by the authors, without influence from any funding source. Conflict of interest: H. Adler reports grants paid to institution from Unilever, during the conduct of the study. Conflict of interest: S. Zaidi has nothing to disclose. Conflict of interest: H. Hill has nothing to disclose. Conflict of interest: S.P. Jochems has nothing to disclose. Conflict of interest: H. Burhan has nothing to disclose. Conflict of interest: N. French reports grants (paid to the University of Liverpool) from Unilever PLC, during the conduct of the study. Conflict of interest: T. Tobery is a full time employee of Unilever, which provided funding for this work; however, T. Tobery's compensation from Unilever is not affected by the work described here or its publication. Conflict of interest: J. Rylance has nothing to disclose. Conflict of interest: D.M. Ferreira has nothing to disclose.