How honest should parents be?

[Aoi Magi]

In you're opinion whether you're a parent or not, how honest should parents be with their children when teaching them about life in this world?

Do you think children deserve a little chill out time not having to worry about global warming, sex, drugs, death, religion and money? 

Or just teach them everything you know right away.

Surely most people would say the best way is somewhere inbetween total insulation from the real world while at the same time not telling them all the mentally disturbing facts about the world too soon?

I think parents should always be honest with children. That however doesn't mean a parent should reveal everything when there's no need for it or without considering the consequences, but parents should slowly prepare and guide their children through honesty. For example don't teach religion is BS to a toddler, rather teach her to question and reach conclusions on her own. Don't bother discussing drugs until they can at least get to school on their own with enough pocket money for that kind of investment. When it comes to sex, don't lie and don't make up obvious bs, cause it is better they find out the truth from their parents than investigating on their own or learn from an outsider.