Question: How do you experiment your hypothesis on food affecting our health?

Duane Mellor answered on 11 Nov 2014:

Most of them have two foods, which have similar energy and nutrient content. One has contains the stuff that may improve health the other does not. Where possible they taste similar and look similar. This is not easy to do. Then you give one group one food and the other group the other food. You tell both groups not to change their diet apart from eating the research food. Ideally neither you as the research or the people eating the food know which food they have, this is called a double blind controlled trial.