I'm writing about my wife, who is an excellent runner. She runs in the morning. She has a bad reaction to breakfast. I spoke to her about eating something before running. If she eats anything at all, she experiences what she calls a "crash". Low energy. It is as if she experiences low blood sugar. She eats very healthily. She says cereal is the worst and she never eats it. She runs in the morning without eating anything. I have worked out without eating and done ok, but usually I eat something;maybe a Clif Bar or Ezekiel muffin with almond butter. I do try to wait at least two hours between eating and working out. But, I can;t figure out what my wife is going through. Any ideas?