Specific barriers to RCTs on nutrition | Comments |
---|---|
Testing a nutrient | Should one use the nutrient as an add-on to usual diet, or should the diet be depleted of the nutrient? |
Testing a food intervention | How to assess dietary intake |
Assessing dietary intake | Combination of diverse methods including the 24-h dietary recall method are likely to be best |
Selection of outcomes | Depends on the objective of the study |