“A complex system that works is invariably found to have evolved from a simple system that worked. A complex system designed from scratch never works and cannot be patched up to make it work. You have to start over, beginning with a working simple system. - John Gall

In other words, the things you record should not be an exhaustive list of everything you can think of; rather, it should build itself out of necessity.

Also - don't measure things simply because you can measure them. (for example, you're counting calories because you can count them, but it's really a waste of time when you can instead recite to yourself every morning, "I will eat healthier foods")