"But also think that while your acne gets bad when you eat wheat, there are lots of other people that eat a lot of it and don't get acne."
--You can't draw any conclusions from that statement. There are a lot of people who smoke and don't get lung cancer. In fact, the majority of smokers do not get lung cancer.
"If wheat could bring acne, most European would be full of acne in the past, as that was the basis of their diet."
--Europeans did not eat genetically modified, selectively bred wheat that has dramatically increased its protein (and thus gluten) content in the last 50 years. They also did not eat quick rise bread, but sourdough traditionally prepared fermented bread which if fermented long enough can even be handled by those with Celiac disease (thus the fermentation process breaks down nearly all of the gluten). And also, I think you are overstating the significance of wheat in many traditional European diets--many regions of Europe ate a majority of their grains from oats, buckwheat, etc which are out of vogue now.
"Even more dramatic, you will see no acne in old asian people, and they didn't eat much meat and no dairy."
--They don't have acne because they ate a diet more similar to a hunter gatherer, meat, fish, vegetables, and rice. Old Asian people did not eat wheat. You could not afford wheat in Korea until very recently. And they cooked with pork lard. Koreans savour the greasiest parts of the pig, and all of their traditional soups are made with pork/ox fat and bones as the base. I think the reason for low prevalence of acne is more likely to be the absence of industrially processed grains and dairy.
"It was only after the western habits took hold of the world that the situation changed."
--That is correct, but "meat" and "animal fat" are not Western inventions. In fact, Westerners ate a lot less calories from animal sources compared to many traditional cultures.
" I would say that it is not only the wheat itself, but the combination of white fiber-less wheat with loads of animal grease that brings this condition."
--Before we can have a useful conversation about this you have to grab a dermatology textbook and look up the "proximal causes of acne."
--All industrialized cultures are full of acne according to the research, and it is at a rate of almost 90% presence in adolescents living in industrialized cultures. It is absent in hunter gatherer populations.
What is the causal evidence you have that "animal grease" causes acne? I think if you have a causal argument as to why animal fat would cause acne, then it would be hard to reconcile with the fact that acne is completely absent from all hunter gatherer populations. These are populations that on average survive on 40-50% of calories from animal sources. Non-industrialized Inuit populations also eat an enormous amount of "animal grease" and do not suffer from acne. It is only when they eat industrialized foods that they begin suffering from acne and other diseases of civilization.
" If you want to try six months of animal products no more than twice a month (and a small portion), avoiding also refined sugars and white rice or white flour of any kind, specially no dairy, you may find some interesting results. The oil from the acne doesn't come from the air, it comes from your diet."
I already have a diet which has made me acne free for 7 years, as long as I remain on it: a paleolithic diet (with added white rice). The acne (and allergies) reappear whenever I reintroduce dairy or grain products. I think I would definitely see "interesting" results by virtually eliminating meat from my diet: a dramatic loss in muscle mass (with no change in acne or allergies, since I currently have none).
PS I'm in Korea now :-)