That's a research based answer to "when is the best time to weigh yourself ?".
Like many people, I've spent much of my adult life trying to keep my weight at a healthy level. Through the years, I've tried various schemes for weighing myself to maximize my motivation. Too often and I'd be frustrated by an increase in weight for no apparent reason. Too infrequently and I was unconscious of the gradual increase in my weight until it hit a level that would require some major action.
Access more information about the study that yielded the answer to this frequently asked question here.