All vegetables we eat have toxins in them and it's precisely these toxins that benefit most of us when eaten periodically. Eaten daily, vegetable meals are probably unhealthy, just as eating meat daily is probably unhealthy. Mediterranean peoples figured this out a long time ago and expressed these findings in religious rituals and texts, with designated feasting and fasting periods, where a feast means lots of meat and cheese and wine, while a fast means humble meals consisting of bread and vegetables and water.
I'd imagine Northern Europeans would benefit from a similar arrangement, though they're likely better adapted to a different periodicity of feasting and fasting, given the climate and the longer periods where fresh food is unavailable.
Bloodletting is a valid medical procedure for hemochromatosis which presently affects around 1 in 200 of those with European ancestry. It's very possible the incidence rate was greater in the past when populations were more locally homogeneous.
It's exceptionally lazy and unimaginative to dismiss out of hand a procedure practiced globally for thousands of years.
I'd imagine Northern Europeans would benefit from a similar arrangement, though they're likely better adapted to a different periodicity of feasting and fasting, given the climate and the longer periods where fresh food is unavailable.