The Study
Protein foods from animal sources, incident cardiovascular disease and all-cause mortality: a substitution analysis.
This study watched what people ate for many years and noticed that those who swapped out bad proteins (like bacon or eggs) for better ones (like nuts or beans) tended to live longer and get sick less. But it didn’t make people change their diets — it just watched, so we can’t be sure the food changes caused the health benefits.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Eating too much meat and eggs might hurt your heart, but swapping them for nuts, beans, whole grains, or fish can help you stay healthier for longer.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 560 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1These changes are as powerful as quitting smoking or getting more exercise — even small swaps like one serving per week help.
- 2Replacing one serving/day of processed meat with nuts/beans/grains cuts heart disease risk by 28–34%.
- 3Swapping all four unhealthier proteins (eggs, meat, poultry) with healthier ones cuts heart disease risk by 54%.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
International journal of epidemiology
Year
2021
Authors
Victor W. Zhong, N. Allen, P. Greenland, M. Carnethon, Hongyan Ning, J. Wilkins, D. Lloyd‐Jones, L. V. Van Horn
Related Content
Claims (6)
People who replace one serving of unprocessed red meat each day with nuts or whole grains have a 9–13% lower relative risk and a 2.0–2.8% lower absolute risk of developing cardiovascular disease over 30 years.
Replacing two or more animal protein sources with healthier alternatives, even just once a week, is linked to lower rates of heart disease and death from any cause.
Replacing one daily serving of processed meat with nuts, legumes, or whole grains is linked to a 28-34% lower relative risk and a 7.5-9.0% lower absolute risk of cardiovascular disease over 30 years in adults.
Replacing one daily serving of eggs, processed meat, red meat, and poultry with fish, nuts, legumes, and whole grains is linked to a 54% lower relative risk and a 14.0% lower absolute risk of cardiovascular disease over 30 years.
People who consume large amounts of animal protein and ultra-processed foods have higher levels of systemic inflammation and a higher incidence of autoimmune diseases and cardiovascular disease.
Replacing one daily serving of eggs with nuts, legumes, or whole grains is linked to a 15–21% reduction in relative risk and a 3.0–4.8% reduction in absolute risk of cardiovascular disease over 30 years.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.