http://www.3fatchicks.com/forum/showthread.php?t=115826
Please check out the above Sticky found over in Support as to why the scale fluctuates. Because from what I can see here, you are talking about a one pound fluctuation.
One pound. A perfectly, reasonable amount, with no "real" explanation required. ESPECIALLY given that you had the "food posioning" episode. You're body was a bit out of whack and it took some time to adjust. Really, this is perfectly, perfectly normal.
You MUST, MUST, MUST remember that weight loss is NOT even. It is not linear. Regardless if we do the same things week after week after week. Chances are we'll get 3 different results for the 3 weeks.
Just as a side note, I know for me (& I know many of the maintainers as well) many times I experienced a "whoosh", where all of the sudden after having small losses, a nice 2 lb or even a 3 lb weight loss will occur.
Also just wondering, had you been doing any exercise prior to "starting" to walk? I think you will find that walking is a great boost to your weight loss. You may want to start thinking about some strength training as well. Stretchie bands are a great way to start. Another thing I would HIGHLY recommend - Leslie Sansone's Walk Away the Pounds DVD's. The 1,2, 3 Mile Express with Stretchie Band is a GREAT beginner's DVD. Wonderfully simple to follow and effective. And really, again, exercise will
greatly help your cause.
Stick with your plan. With a tweak here and there as needed. BREATHE. Relax. Learn to enjoy the process as you learn about your body. Because it's an ongoing one. Know that you're doing the right thing for your body and in turn your body will do the right thing for you.