Table 1.

Overview of study design: measurements, interventions, and planning.

Measurements and characteristics of the intervention			Timepoints (weeks), t
Diet
	Diet quality (Dutch Healthy Diet Index) per food category and total score	0, 8, 16
	Carotenoids in blood (biomarker fruit and vegetable intake)	0, 8, 16
	Food purchase data at retailer (via customer card)	4, 12
Subjective health
	Self-perceived health questionnaire	0, 16
Consumer experiences
	Evaluation questionnaire	16
Metabolic health
	Waist circumference	0, 8, 16
	BMI	0, 8, 16
	Blood pressure	0, 8, 16
	Lipid profile (total cholesterol, HDLa, LDLb, and triglycerides)	0, 8, 16
	Fasting glucose	0, 8, 16
	C-peptide	0, 8, 16
Personalized advice
	Stage 1: automated advice based on individual diet quality and metabolic health status	0, 8
	Stage 2: telephone consultation with dietitian to define behavioral change strategy and discuss personal preferences	0, 8
Feedback
	Diet quality discussed in telephone consultations with dietitian	0, 8
	Alternatives for product purchases in email messages from dietitian	4, 12
	Metabolic health via web-based platform	0, 8, 16
	Integrated personal health score via web-based platform	0, 16

^aHDL: high-density lipoprotein.

^bLDL: low-density lipoprotein.