Reduction in saturated fat intake for cardiovascular disease

Area of Science:

• Cardiovascular Health
• Dietary Fat Metabolism
• Clinical Trial Analysis

Background:

• Reducing saturated fat intake is known to lower serum cholesterol.
• The impact of saturated fat reduction on other health outcomes and optimal dietary replacements remains unclear.
• Investigating the effects of replacing saturated fats with polyunsaturated fats (PUFA), monounsaturated fats (MUFA), carbohydrates (CHO), or protein is crucial.

Purpose of the Study:

• To evaluate the impact of reducing saturated fat intake on mortality and cardiovascular morbidity.
• To assess the effects of replacing saturated fat with PUFA, MUFA, CHO, and/or protein.
• To synthesize evidence from all available randomized clinical trials.

Main Methods:

• Conducted comprehensive literature searches of multiple databases including CENTRAL, MEDLINE, and Embase.
• Included 15 randomized controlled trials (RCTs) with a minimum duration of 24 months and 56,675 participants.
• Performed random-effects meta-analyses, meta-regression, subgrouping, and GRADE assessments to analyze data.

Main Results:

• Reducing dietary saturated fat intake led to a 17% reduction in combined cardiovascular events (moderate-quality evidence).
• Greater reductions in saturated fat intake correlated with greater risk reduction for cardiovascular events.
• Little to no effect was observed on all-cause mortality, cardiovascular mortality, or specific events like myocardial infarction and CHD mortality (moderate to low-quality evidence).

Conclusions:

• Reducing saturated fat intake for at least two years significantly reduces combined cardiovascular events.
• Replacing saturated fat calories with PUFA or carbohydrates appears beneficial for cardiovascular health.
• The benefits observed were consistent across different study durations, sexes, and baseline cardiovascular risk levels.