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As of 2022, 126.9 million Americans ages 20 and older have some form of CVD, the NIH reported.

"The average American eats a 1:3 plant to animal protein ratio. Our findings suggest a ratio of at least 1:2 is much more effective in preventing CVD. For CHD prevention, a ratio of 1:1.3 or higher should come from plants," said lead author Andrea Glenn, visiting scientist in the Department of Nutrition.

Over the course of the study period, 16,118 CVD cases, including over 10,000 CHD cases and over 6,000 stroke cases, were documented.

After adjusting for participants' health history and sociodemographic and lifestyle factors, the study found that eating a higher ratio of plant to animal protein was associated with lower risks of CVD and CHD.

They found that risk reduction for CVD begins to plateau around a 1:2 ratio, but that CHD risk continues to decrease at higher ratios of plant to animal protein.