I personally think it’s the worst way to fast. In the end, you can still eat a lot of unhealthy stuff in the morning and in the evening (timing differs, easier in winter) while you can’t drink any water during the day. Especially the latter part should just be a no go criteria for most people. Especially if you exercise physically in summer. Just completely whack in my opinion.

If the Christian way of fasting makes sense can be debated. But at least it raises no health concerns.