I don't think someone can lose 4 pounds of muscle and/or fat in a day. It was either water retension, food in your digestive system, or some other factor such as shoes, clothing or misreading the scale. I wouldn't be too concerned about the daily loss like I would be the total loss in a week or two.
I have gained over 10 pounds in a weekend when I went to a cousins wedding only to lose it on Monday.lol.
28/M/TX single parent of gorgeous 3yo girl (revised 12/12/08)
Severe Colitis (pancolitis) since January 9, 2005
currently: Mildly Flaring
RX/day: none! Tapered off Prednisone 9/20/08. Lost job and insurance 10/2007 and stopped taking asacol and Imuran cold turkey
OTC: enzymes everyday, turmeric, seldom use probiotics, vitamins & other natural treatments
Diet: SCD helps tremendously, but am not strictly on it.
Other: Prayer, food combos, good posture, chewing more, etc.