Burnis is right. The best way to "weigh" yourself is not with a scale but also with a BF% device. Yes, they vary in accuracy from person to person, but as long as your not comparing yourself with someone else, that's ok. They stay just accurate on the same person if you measue same time/circumstances. I did some research on myself when I went on a low carb diet for 6 weeks. I dropped a total of 34lbs and 4 1/2" around my waist. I weighed myself on a scale through out the day to see how different foods/drinks/activities affected my weight.
You generally weigh less at morning because your body has been in a "fast" and have not consumed any water. By the end of the day, you tend to have gained because you have unburned food or "calories" and plenty of water still in your system.
I noticed that when I exercise in the after noon and eat no later than 6pm, I can weigh, for example, 226lbs, but when I wake up in the morning, my body has burned off a lot and dropped some water. I end up weighing about 220 to 222lbs.
Most body comps will give you how many lbs of fat you have. That's a more important value for people like us. If it doesn't, just multiply the % X's your weight.
(one of my measurements) If you weighed 227 and were at 25.5% body fat, thats about 58lbs body fat. If you droped (like me) 7 lbs and then were at 23.6% body fat, that's about 52. That means I lost at least 6lbs of body fat. There's still 1 lbs which could be water or LBM. Since I wasn't doing any weight lifting, just cardio, it was probably LBM.
Hope that helps. I'm not much of a nutritionist but I do like to do some research.
