What all do you do to prepare before TTC?

When I juice, it includes a lot of leafy green vegetables. Actually, I've used all kinds of vegetables and usually I can cover up the taste with a little lemon and then add fruits for taste. Even on a juice fast, people drink water, I definitely don't think they are causing huge blood sugar spikes, especially not anymore than a typical diet including soda, candy, desserts, etc.

I think it's more nutrient dense than someone eating a normal day of junk food. That's also nutrient deficient but a great deal of people (including me at different times) wouldn't think much of only having pizza and soda one whole day.

Also, the reference about juice fasting was for before the pregnancy, a complete fast for a short period is not going to kill an adult, even if I was consuming zero nutrients, so not sure what's unsafe about it.