Keep research questions simple and focused on one thing at a time. A question mixing height, weight, lunch choices, and SAT scores is really three separate questions and won't work. Break complex ideas into individual questions you can actually answer.
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Try not to put too many things in your research question, because then there's a lot of moving parts. Is there a strong relationship between height, weight, what people had for lunch on their SAT scores? Well, now I've got a lot of moving parts in that question. It might actually be three questions, one for each of those height and SAT scores, weight and SAT scores and what they had for lunch and SAT scores is going to be much easier to handle and to measure. And if you're looking for assistance with your research questions, join our free Dissertation Help community to get help from dissertation chairs who've helped many people get through this process and graduate.