Mark is on the money. It is about travelling in a narrow weight range.
Key practices of those who successful loss weight and keep it off for more than two year (from a research study) are:
1) They weigh themselves every day to monitor and keep their weight in check.
2) Their food is pretty routine and doesn't vary a lot (same foods - same potions).
3) They exercise at least an hour each day.
As someone who has kept the weight off for more than two years...I can concur that these findings.
If you are coming near to goal weight loss...do take heart - maintenance is far easier than the pointy end of the weight loss.