when i used to go to diet club i was weighred in the evening. I worked on the principle that on my weigh in days, i could eat "Light" food (so for example a mars bar was og, only weighing 60 grammes but pasta not ok as it weighed more)
On my weigh in day, I always weigh myself first thing in the morning in the nude and keep a record and then again fully clothed before I go to my class. It can be as much as 5lb difference.
Yes, they certainly do. Mine varies by about 4-5 lbs depending on what Ive eaten during the day
bednobs, I dont think it matters the weight of the food, its the calories that count
i,.e if you eat a pound of sugar, I dont think you would just put on a pound but if you ate a pound of fruit and veg you would hardly put on anything