Plant vs. Animal Protein Intake: What the Science says about Cardiovascular Mortality

Topic

applied sciences

Frequently Asked Questions (FAQ)

What was the main objective of the study? The primary goal of the study was to examine the relationship between the intake of animal and plant-based protein sources and the risk of all-cause mortality, as well as specific causes of death such as cardiovascular disease (CVD), cancer, and other causes. The research also investigated the effects of substituting different protein sources within the diet.
How was protein intake assessed in the study? Dietary intake was assessed using food frequency questionnaires (FFQs), which participants completed every four years. These questionnaires collected information about how often they consumed various foods over the past year. From this, researchers calculated average daily intake of animal and plant protein, expressed as a percentage of total energy consumption. Animal sources included processed and unprocessed red meat, poultry, dairy, fish, and eggs. Plant sources included bread, cereals, pasta, nuts, beans, and legumes.
What were the key findings regarding animal protein intake and mortality? The study found that higher animal protein intake was associated with a slightly increased risk of mortality, particularly from cardiovascular disease. This link was primarily observed among individuals who also had at least one unhealthy lifestyle factor such as smoking, excessive alcohol consumption, being overweight or obese, or physical inactivity. Interestingly, for those with a healthy lifestyle profile, no significant correlation between animal protein and mortality was found. A 10% increase in energy from animal protein was weakly associated with an 8% increase in CVD mortality.
What were the key findings regarding plant protein intake and mortality? Conversely, higher plant protein intake was associated with a lower risk of all-cause and cardiovascular mortality. This protective effect was more pronounced among those with an unhealthy lifestyle, such as those who were older, smoked, drank alcohol heavily, were overweight/obese, or physically inactive. A 3% increase in energy from plant protein was associated with a 10% decrease in all-cause mortality.
Did the study find that substituting protein sources affected mortality risk? Yes. The study demonstrated that replacing animal protein with plant protein was associated with a reduced risk of mortality. In particular, the substitution of 3% of energy from plant protein for an equivalent amount of energy from processed red meat, eggs, and dairy was linked to a substantial decrease in all-cause mortality. Substituting plant protein for processed red meat was associated with the largest reduction in mortality risk.
Were the effects of protein intake different in those with healthy lifestyles compared to those with unhealthy lifestyles? Absolutely. The associations between protein intake and mortality were significantly modified by lifestyle factors. Specifically, the detrimental effects of higher animal protein and the beneficial effects of higher plant protein were largely confined to those with at least one unhealthy lifestyle factor. Among people with a healthy lifestyle there was no significant link between increased animal protein intake and increased mortality.
How did the study adjust for potential confounding factors? The study used a nutrient density model and adjusted for various dietary and lifestyle confounding factors such as total energy intake, percentages of energy from fats, smoking status, body mass index (BMI), physical activity, alcohol consumption, history of hypertension, and intake of whole grains, fibre, fruits, and vegetables. Additionally, propensity scores were used to address residual confounding.
What are the public health implications of this research? The findings highlight the need to prioritize protein sources in public health guidelines. Replacing animal proteins, especially processed red meat, with plant-based options could significantly improve health. This change may be especially valuable for individuals with unhealthy lifestyle habits, reinforcing the broader goal of promoting better long-term health outcomes.

Significance

Understanding these findings helps advance our knowledge and inform better decisions. This research represents an important contribution to the field. For the full details, watch the video above and explore the linked resources.

Resources & Further Watching

Read the paper ‘Association of Animal and Plant Protein Intake With All-Cause and Cause-Specific Mortality ’: https://doi.org/10.1001/jamainternmed.2016.4182

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