What do I need to measure interaction between variables in a particular equation?
For e.g. Me just taking 50 grams of protein everyday will help me health wise. Me just doing exercise for 1 hour everyday will help me health wise. Me just stretching 1 hour everyday will help me health wise. Etc.
But Combing two of the above things will help me more health wise than just doing one. And combining all three will help me even more than just doing two of the above things.
For e.g. Taking 50 gm protein and doing 1 hour exercise everyday is beneficial than just doing one or the other. How does taking 50 grams of protein complement exercising 1 hour every day, by how much?
What I want to find out is, a way to measuring interaction between these things. How can I quantify a relationship between each above?
What type of data-set will I need to quantify how they compliment each other?
Note: I don't know if this is the right place to post this question. Please suggest.
Any suggestions are much appreciated.