Maybe his method works only for him, but I doubt it. David has diabetes, by the way. See his 2012 article at HealthCentral for details. Here’s a bit:
One cornerstone of this new way to lose weight and maintain weight loss is a twist on a standard dieting recommendation. But instead of weighing myself once a week, I weigh myself every morning.
Supposedly people get discouraged from daily weigh-ins because our weight seems to fluctuate up or down a couple of pounds every day for no good reason, or for at least for no reason that we can figure out. The fluctuations are certainly true in my experience. But, of course, the same fluctuations happen when we make our weigh-ins once a week, and that would be even more misleading.
Then, when the scales tell me that my weight is up that morning from the previous morning, I make an immediate course correction, which we know is easier in the long run than to wait until things get totally out of hand. My immediate course correction is simple. I skip dinner that day.
Note well, however, that skipping dinner could lead to major hypoglycemia if you’re taking certain diabetes drugs. Work with your personal healthcare provider on drug dose adjustments.
Diabetic Mediterranean Diet 
Weighing yourself in the morning after urinating is pretty standard and the most reliable way to track changes over time. Same is true for waist measurements.