Well, perhaps, if you look at it over a week, you might notice a difference. Do you have a balanced diet? Do you have sorta roughly fixed meals (i.e. saturday is always pizza night, Monday is chicken or whatever) or do you eat whatever you feel like. If you have a cycle of meals, it might balance out better over a week. Other than that, it could be down to an unusual metabolism....

Yesterday it said I put on 8lb (within 48 hours), my graph continues to shoot up and down. Cate remains steady with a loss of 1lb.

Usually the same food everyday... maybe I should see a doctor

I'm not proud of it but I'm one for habits when it comes to food. If I end up liking a dinner then I'll have it everyday until I don't like it. Same with music, same album every day.

That's not healthy at all. I mean, I can eat pasta dishes til the cows come home, but I don't, because I know it won't do me any good. You should try planning your food in advance. Maybe 2 or 3 meals swapped about for a couple of weeks, then try getting 6 different meals and 1 you can repeat after that.

Same with lunch, if you make your own sandwiches, change the fillings. If you buy them, change that as well.

I'm the same as you a bit, I stick with what I know.  If I go to a certain restaurant I tend to order the same thing every time.  And at home I probably eat the same things but I mix it up with different days.  Plus I'm a fussy eater because the only animals I eat are chicken and fish.

With those avators I think not!