Researchers want to identify the impact of cholesterol on the development of heart disease. they follow individuals who are vegan, vegetarian, and meat-eaters for 10 years and they record if any of them experience a heart attack. what kind of epidemiologic study was this?

Cohort study

Explanation:

Cohort study: The cohort study is defined as a longitudinal study that takes a sample of cohort that performs a cross-section at different intervals concerning time.

In this context, the cohort is known as a particular group of individuals who incorporates a defining character, usually those individuals who have accomplished a specific event in a particular period, like birth order.

Cohort study comes under the observational studies.

Example: In the question above the researcher wants to identify the impact of cholesterol on the development of heart disease.