Dark blue - the way I look at it when I've eaten badly/not exercised for a while is this.

I'm like a car that's been sitting in the garage for too long with bad fuel in it. It needs to be jump started, needs good fuel put in and the oil replaced, and to be driven around for awhile to get it back to running well. You've fed yourself bad fuel and not kept up with the maintainence, so it's going to take some good fuel and some light exercise before you start running properly again. And until you're running properly again, it will be hard.