Im totally obssessive as well, lol. I was talking to DD yesterday and got as far as 'do you know whats weird?' and she burst out laughing. When I queried it she said it was coz she knew it was diet related coz pretty much everything that comes out my mouth is, lol.
Used to have all those measurements in an excel spreadsheet with line charts for each one - now that's obsessive. Funnily enough though I used to stop updating it whenever those lines took an upward turn lol.