Food Journal

My friend and I went to a talk this evening on gut health with Laura De Sanctis (in collaboration with Consonant Skincare), and I was inspired to start a food journal. Laura recommends tracking your mood before eating, what you eat, and how you feel after eating - for around a week or so. I thought this would be perfect leading up to my November eat-at-home challenge, so I dug up a little Moleskine notebook and will be starting tomorrow. I'm feeling rather excited about this. Do any of you keep a food journal?