We only know how the human body reacts in 0g - and it's as bad as you say. But we don't know if 0.3g is bad. Humans might live perfectly fine in 0.3g, or it mig

We only know how the human body reacts in 0g - and it's as bad as you say. But we don't know if 0.3g is bad. Humans might live perfectly fine in 0.3g, or it might be as bad as 0g. However, there's no data either way to make the claims you are making.