I have to think of something to do for a science fair project on nutrition. if u have any ideas that would be really cool.

Question

You need to think of ideas that interest you. Don't worry about others thinking that the idea is "cool."

What nutrition topics interst you? Fasting? Anorexia? The effect of carbs, fats, protein or some other aspect of foods? Timing, size and frequency of meals eaten? The effect of any particular type of diet or comparing the effectiveness of various diets?

Although the following article only relates tangentially to nutrition, it might give you some ideas.

http://www.members.cox.net/dagershaw/lol/MenarcheThin.html

I hope this helps. Thanks for asking.