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Design Issues in Personalized Nutrition Advice Systems
However, self-efficacy is difficult to influence, also when using personalized advice, as shown by Doets et al [24]. They found that self-efficacy decreased during the study in both the intervention group that received personalized nutrition advice and the control group that received generic dietary advice.
J Med Internet Res 2023;25:e37667
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Therefore, individuals eligible for study participation were invited for additional screening to verify whether they were at risk of Met S, defined as an excessive waist circumference (≥88 cm for women and ≥102 cm for men) combined with elevated fasted triglycerides levels (≥1.7 mmol/L), reduced HDL level (
On the basis of the study by Doets et al [36], we performed a power calculation to estimate an adequate sample size to identify potential health effects.
JMIR Form Res 2021;5(6):e25043
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