Why do you need a clinical test to determine how your body reacts to a type of food? Dont most people take note of how food affects them at every meal? When you wake up with a hangover, do you need to go to the doctor to determine if it was the hamburgers or the 12-pack that caused it?

For most of us who follow this "fad" it comes down to this: Take away the gluten, symptoms go away. Add the gluten, symptoms return. Thats all the evidence I need to cut gluten out of my diet. There are no nutrients in wheat that cant be obtained in greater densities from healthier, tastier, whole foods which dont contain potentially gut-destroying anti-nutrients. So really it doesn't matter if you have celiacs or gluten-intolerance or not; there's technically no good reason to include gluten in your diet anyway (except for pizza and beer which are the only things that are occasionally worth the stomach issues in order to enjoy!)

The world has many challenging problems that require the brightest minds to solve. Environmental, architecture, energy, etc. These overlap with the traditional math&sciences core but if she's motivated to "make a difference", these will be challenging on a different level , requiring social, political AND technical skill to implement correctly. Urge her to steer away from useless academic programs and focus on programs that provide 'real world' opportunities.