I don't think it was all cell volumization. I'm thinking you ate a bit less than you think and burned alot of it up throughout the day just walking etc. The fat loss may not necessarily show up in the mirror. Also, when you are coming off a diet, you're more likely to gain in different spots than when you were losing (ie doesn't come back on in reverse). You also more likely to hold some water in the skin that may look like fat but is not. Like you said, you thought you gained 6 from the mirror but was only 1.4. After a diet, I always notice that 180 pounds on the way up doesn't look as good as the 180 on the way down (if that makes sense). All in the way your body holds water and gains fat, etc.