When people started eating less seed oil in the 1970s and 80s, heart disease cases dropped by 30%, which might mean that changing fats in the diet helped reduce heart problems.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether individuals who reduced LA intake had lower CHD risk.
A prospective cohort of 50,000 adults with repeated dietary assessments from 1970–1990, tracking CHD incidence and comparing those who reduced LA intake vs those who did not, adjusting for smoking, medication use, and socioeconomic status.
Whether lowering LA intake reduces CHD events.
A long-term RCT of 15,000 adults randomized to low-LA or high-LA diets for 10 years, measuring first CHD event as primary outcome, with blinded adjudication.
Overall effect of LA reduction on CHD risk across all trials.
A meta-analysis of all RCTs and cohort studies assessing LA reduction and CHD outcomes, pooling relative risks and assessing dose-response.
Interpret historical trends and propose hypotheses about dietary impact on CHD.
A narrative review analyzing food supply data, CHD trends, and public health policies from 1970–1990 to assess potential dietary contributors to declining CHD rates.