Theory of planned behavior

And there's quite a few of them in the world of nutrition.

So you've got like the theory of planned behavior, or you can use ones that aren't specific to your intervention, like the behavior change wheel, which can be used in many different in different disciplines.

So also I think it's important to be drawing on a wide range of evidence to make sure that you're incorporating, especially both qualitative and quantitative.

So I also think the realist approach is quite important because it doesn't limit evidence based on quality appraisal.