Treat it like a study. Only change one variable at a time and observe changes. Note any potential confounding variables. You talk as if only scientists can science or apply the scientific method, which is entirely the wrong view to take. It should be something everybody is capable of using and generally everybody is if they're genuinely interested in doing so. I've been in academia for a long time, what we do isn't that special.
We should be (and there are people who do) encouraging people to learn how their diets, their behaviors affect them emotionally, physiologically and psychologically. Scientific studies really aren't as applicable to the general population as one would like to believe. So the only way to learn is to experiment on themselves.
We should be (and there are people who do) encouraging people to learn how their diets, their behaviors affect them emotionally, physiologically and psychologically. Scientific studies really aren't as applicable to the general population as one would like to believe. So the only way to learn is to experiment on themselves.