My gf had terrible headaches, constant nausea, and terrible drowsiness whenever she was hungry for her entire life... until I met her. I suggested she might be hypoglycaemic and should carry around a sugary treat or drink wherever she goes. She started doing that and quickly her hunger sickness symptoms could be basically controlled. But they were still there. One thing I always found strange about her eating habits was her insistence on having lots of bread. She never felt satisfied or full without bread.

After a year of doing that my mom suggested she might be gluten intolerant. My gf had never heard of the concept, had zero friends on any kind of gluten free fad diets. She decided to give it a shot, no gluten for 4 weeks. Boom all symptoms gone. More tests led her to trying out gluten after a week, and what do you know it was back. She waited two weeks, back again. Eventually she figured out a system in which she could have a gluten meal/snack/treat every four weeks without symptoms appear.
Also, she started to feel satisfied and full without an urge to eat bread, almost like the bread caused a weird drug like addicting withdrawal cycle which seemed to be why she always craved it. The gluten seems to build up in her system, or at least the allergic reaction and her body goes through a withdrawal after she has had too much, or too much too frequently, and doesn't get more in her system soon enough.

I eat gluten just fine. Together we eat vegetables, meat, fruit, and occasional pieces of the best gluten free bread (most of its sucks). I tend not to eat tasty gluten stuff around her unless it is a treat day for her Gluten products also make people fat, so it really isn't a problem to not eat them. No one on the planet requires gluten to live a healthy lifestyle. Bread, white bread in particular just gets converted into sugars and fat inside the body. It is empty calories.