Long-term health outcomes like cancer require long-term observational studies or interventional trials, as short-term nutritional studies can only provide hypotheses.

“the short-term studies don't give us some hypotheses but if you don't with drugs it's different but with it may be a gold standard a double-blinded controlled trial with a drug but with nutrition and the fact that we live a long time and you don't see the effects of what the advice is for decades later cancer what we do now causes cancer 20 30 years down the road if you don't look at what happens down the road with nutritional interventions then you're not looking at that then you're not finding you then you can you're not getting the right information out of the studies you have to look at long term with nutrition”