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Mendelian Randomization Studies of Coffee and Caffeine Consumption
Marilyn C Cornelis1, Marcus R Munafo2
1Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA. marilyn.cornelis@northwestern.edu.
Nutrients
|September 23, 2018
Summary
Mendelian Randomization (MR) studies suggest coffee and caffeine consumption likely do not causally impact many common diseases. However, limitations mean a definitive causal link cannot always be ruled out.
Area of Science:
- Genetics
- Epidemiology
- Nutritional Science
Background:
- Coffee and caffeine consumption are linked to various health outcomes.
- Distinguishing correlation from causation in these associations is challenging.
Purpose of the Study:
- To evaluate the causal impact of coffee and caffeine on health using Mendelian Randomization (MR).
- To describe genetic instruments and MR challenges specific to coffee and caffeine research.
Main Methods:
- Utilized Mendelian Randomization (MR) with genetic instruments for coffee and caffeine intake.
- Reviewed at least fifteen MR studies investigating various health outcomes.
- Discussed key MR concepts and challenges, including pleiotropy and collider bias.
Main Results:
- Most MR studies found no consistent evidence for a causal role of coffee or caffeine in conditions like type 2 diabetes, cardiovascular disease, and neurodegenerative disorders.
- Limitations such as low statistical power and potential biases mean causal roles cannot always be excluded.
Conclusions:
- Current MR evidence does not strongly support a causal relationship between coffee/caffeine and many major health outcomes.
- Advanced MR methods and genetic discoveries are needed for definitive causal inference.
Keywords:
Mendelian Randomizationbehaviorcaffeinecausalitycoffeeepidemiological methodsgenetic epidemiologyMore Related Videos
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