You've lost 105 lbs? WOW!!! That's fantastic!!! Congratulations.
Anyway, there are times where we do kinda slide a little, but have to make certain that we don't slide too far. We don't want any lapse turning into a relapse turning into a total collapse!!
How to re-focus? Well do you plan out your meals ahead of time? Do you know EXACTLY what you will be eating for each and every meal and snack? If you've got a plan in place, it is MUCH easier to stay on plan, regardless of how focused or unfocused you are. This all would never, ever work for me if I don't decide IN ADVANCE what I will be eating for the day - no matter what the circumstances. I plan ahead, shop, cook, prepare and take foods with me, never leaving my food "up to chance". It's just too easy to lose focus and make poor choices without that advance pre-thought and pre-planning. For me, "failing to plan IS planning to fail". Your home MUST be stocked with the "right" foods, so that you have what to eat and AVOID the "wrong" foods.
Another way to stay focused - counting/tracking calorie and food journaling. Both great eye openers and great ways to keep your food choices on track and remain that priority that they need to be.
And like you said, you know what to do - now get out there and do it - but by all means, set yourself up for success - the planning, the counting, the journaling.
Nip this in the bud and remember what it is you want the MOST from life.
