Mixed
Membership in commercial Nutrition Clubs providing fortified meal replacements and nutrition education is associated with significantly lower fasting insulin, lower HbA1c, higher vitamin D and vitamin E status, and a lower prevalence of metabolic syndrome compared to community-matched controls.
Joining a structured nutrition program that uses meal replacements and provides education can significantly improve metabolic health markers like insulin sensitivity and vitamin levels, even if weight loss isn't the primary visible outcome. The key is consistency (weekly attendance) and the nutritional quality of the replacements.
NC members had significantly lower fasting insulin (P < 0.001) and lower HbA1c (P = 0.008), higher levels of 25 hydroxy-vitamin D (P = 0.001), and vitamin E: cholesterol ratio (P < 0.001), and lower prevalence of metabolic syndrome (P = 0.02) compared to CC.
Why this rating
Cross-sectional design prevents causal inference; however, rigorous matching and independent analysis mitigate some bias.
Source
Association of nutrition club membership with markers of health: a cross sectional study
Sai Krupa Das et al. · BMC Public Health · 2017
DOI 10.1186/s12889-017-4219-6
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