#478: Exposures in Nutrition – Why They're Crucial to Understand
Sigma Nutrition Radio
Danny Lennon
4.8 • 633 Ratings
🗓️ 18 April 2023
⏱️ 62 minutes
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Summary
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Description:
Understanding the concept of an "exposure" is a critical aspect to nutrition science literacy. The 'exposure of interest' refers to the variable or factor that is being studied to determine its relationship with a particular health outcome.
For example, in a study examining the relationship between diet and heart disease, the exposure of interest may be a particular nutrient or food group, such as saturated fat or red meat consumption.
But when reading research we need to be able to critically examine the levels of an exposure and ask were these suitable for the research question at hand.
For example, is there a sufficiently wide contrast in the exposure between the groups being compared? How do the reported levels of intake relate to what we know about this exposure from the wider literature?
Much has been made of the many 'null' associations found in nutrition epidemiology. But in many cases, these may be accounted for by looking at the exposure contrast or absolute intakes in those studies. Something we referred to as "null by design".
In this episode, Danny and Alan go through the most crucial aspects to understand about the exposure of interest in nutrition, hopefully leading to an enhanced understanding of interpreting nutrition research.
Transcript
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| 0:00.0 | Hello and welcome to Sigma Nutrition Radio. This is episode 478 of the podcast today. |
| 0:21.6 | My name is Danny Lennon and alongside me as usual is Dr. Alan Flanagan. |
| 0:26.6 | Alan, how are you? |
| 0:27.6 | I'm very well. |
| 0:28.6 | Today our plan is to talk about a concept that really is central to understanding nutrition science, |
| 0:34.6 | one which regular listeners will have heard us mention on many different |
| 0:39.0 | episodes previously, whether that has been in overview-level topics like our episode on |
| 0:45.3 | nutritional epidemiology itself, or in individual episodes where we've talked about maybe a |
| 0:51.3 | specific study and talked about the importance of looking at |
| 0:54.6 | the different exposures in that study, or in other conversations where we've talked about the |
| 0:59.5 | unique challenges of nutrition science as a field compared to others, and particularly when we're |
| 1:04.5 | looking at diet disease relationships in epidemiology. And that is the central concept of the |
| 1:10.2 | exposure in nutrition science. And it really |
| 1:14.1 | is something that has been flagged as something that is unique. And there are distinct differences |
| 1:18.6 | from maybe some other fields. Hence why you may have heard us before talk about how we need to have |
| 1:24.8 | a different view of nutrition science and asking nutrition questions |
| 1:30.2 | in research versus maybe asking questions in biomedicine in a very strict way. |
| 1:36.2 | And so the goal of this episode is maybe to walk through some of these unique aspects of exposures |
| 1:40.9 | in nutrition science, understand what we mean by exposure, |
| 1:44.7 | understand how this rears its head |
| 1:46.8 | when we are interpreting studies ourselves, |
| 1:50.1 | or where we're trying to look at |
... |
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