Dry-Cured Ham and Cardiometabolic Health: A Recent Review Explores Unique Dietary Effects
A recent systematic review and meta-analysis, published in Foods, investigated the effects of dry-cured ham consumption on cardiometabolic and vascular health in adults. This study aimed to differentiate dry-cured ham from other processed meats, given its unique nutritional profile.
Cardiovascular disease (CVD) remains a primary global cause of mortality, with diet recognized as a significant contributing factor to cardiometabolic risks. While general processed meat intake has been associated with increased CVD risk, traditional dry-cured hams possess distinct characteristics. These include prolonged curing that generates bioactive peptides and a high proportion of monounsaturated fatty acids, such as oleic acid. Such properties may lead to different physiological effects compared to industrially processed meats.
Methodology and Study Scope
The review meticulously included human intervention studies, specifically randomized controlled trials (RCTs) and non-randomized prospective studies. Researchers extracted data from major scientific databases including PubMed/MEDLINE, Web of Science, Scopus, and CENTRAL.
Eligibility criteria for inclusion were stringent: adult participants (18+), assessment of whole dry-cured ham consumption, comparison with a control diet, and measurement of cardiometabolic or vascular health markers.
The analysis ultimately included five clinical trials published between 2003 and 2022, totaling 315 participants.
All studies included in the review were conducted in Spain and focused exclusively on specific Iberian dry-cured ham products. Participants consumed daily doses ranging from 40 to 120 grams over durations of 4 to 8 weeks.
Key Findings on Health Markers
The review's findings offered several insights into the consumption of dry-cured ham and its effects on various health indicators:
Blood Pressure
Blood pressure outcomes were largely neutral across the studies. Modest reductions in ambulatory systolic and diastolic blood pressure were observed in individuals with existing cardiometabolic risk factors. In healthy adults, however, no significant changes were noted.
The pooled meta-analysis showed a statistically significant, albeit small, reduction in diastolic blood pressure.
Lipid Profile
Regarding lipid profiles, some individual trials reported favorable shifts. These included increases in high-density lipoprotein (HDL) cholesterol and reductions in low-density lipoprotein (LDL) cholesterol and triglycerides.
However, the pooled meta-analysis presented a slightly different picture: it indicated a significant reduction in total cholesterol (5.37 mg/dL) but no significant effects on LDL, HDL, or triglycerides when data was combined.
Other Markers
Beyond blood pressure and lipids, individual trials also reported several other favorable effects. These included positive impacts on endothelial and inflammatory markers. Researchers observed reductions in plasminogen activator inhibitor-1 (PAI-1) and various inflammatory cytokines, alongside an improved microvascular vasodilatory response. Additionally, one small non-randomized study suggested favorable shifts in oxidative stress markers.
Methodological Considerations
It is important to note that substantial heterogeneity was observed across outcomes in the studies. Furthermore, methodological concerns were identified. These primarily related to selective reporting and open-label design in the included RCTs. The non-randomized studies, by their nature, carried a serious risk of bias due to uncontrolled confounding factors.
Conclusion
The review concluded that moderate consumption of Iberian dry-cured ham (40–120 g/day) does not adversely affect conventional cardiometabolic risk markers in adults.
While pooled analyses showed small but statistically significant reductions in diastolic blood pressure and total cholesterol, the overall findings do not definitively indicate that dry-cured ham is cardioprotective. The authors highlighted several limitations, including the small number of short-term studies, reliance on intermediate biomarkers, and the specificity of Iberian ham products, which may limit the generalizability of the findings.
Further well-designed Randomized Controlled Trials (RCTs) are recommended before considering any revisions to existing dietary guidelines regarding dry-cured ham.