I don't believe in an ideal type of food. Are you living in a tropical jungle? On the coast? In the Alps? Next to a river? Near the Arctic? On the Equator? I have travelled quite a lot in my life, and seen a lot of local markets, mostly in Asia, Africa, Nepal, Sri Lanka... And one thing I have noticed: most warm/tropical/sub-tropical countries do still eat grubs, not as a staple, but it is still there. In the colder climates you don't go for insects, well, there aren't that many around. Walk through a forest in Northern/central Europe, and you don't hear that many sounds, but in the tropics, it's such a racket... there are simply so much more things out there...
It's true that the colder the climate, the more the focus is on big animals. In the warmer places they eat also bats, birds, etc... Sure, buffalo is common, and porc is king is many places in Asia. But there is SO more variety in the diet, which I do miss when I am in Europe.
Yes, animal fats are difficult to get in nature. But sometimes there's a bit too much focus on it.
If you eat a grub, you get the whole package. 

Your whole post is talking about present day. Megafauna used to live all over the planet in multiple different climates and habitats. Nowadays there's pretty much only elephants and rhinos, and I suppose hippos. Even those few animals live in various different habitats, from jungle to desert, tropical to subtropical, aquatic and terrestrial. The lack of megafauna today means people need to eat something else, such as insects.
Yes there are lots of insects and grubs in the tropics. But many insects actually aren't that easy to catch. Grubs need to be dug out of the ground or trees/logs need to be broken into to access them. Imo it goes against optimal foraging theory. Ie. hunting insects and grubs burns, relatively speaking, a lot of calories for a small return.

To me it seems like humans aren't meant to eat insects or worms unless in a starvation situation.

I agree.
The ideal prey for humans imo are megafauna, which is likely why the vast majority of the world's megafauna species are now extinct. Megafauna provide ample fat. The majority of today's wild mammals are relatively small and lean and would likely lead quickly to rabbit starvation.

Sun Bathing along with practicing natural hygiene, and eliminating the triggering foods is the best way to begin to deal these kind of issues. The skin excretes oily substances laced with a food for certain bacteria, these bacteria intern detoxify the skin while producing vitamin D from UV light. This is a delicate process and is easily disrupted by using cleansers, other cosmetic products, antibiotics, sun avoidance, and in part leads people to become unable to obtain optimal hormonal balance. 

I work outdoors usually wearing nothing but a pair of shorts and shoes, so I get a  ton of sun exposure.
I don't voluntarily apply anything to my skin other than cold water (short cold showers).
I haven't taken antibiotics since I was a child or teenager.
I don't eat triggering foods unless grassfed beef (fat) or offal could be considered a trigger. I haven't eaten offal in 3 months now. There has been no improvement in symptoms.

I guess I just need to be patient. It's only been 8 weeks since I stopped drinking from plastic bottles and replaced it with river water.
I started taking the zinc a couple of days ago, let's see what happens with that.

the salmon oil was rancid before they even put it in the bottle.   

Is there a reason why you state this as if it's a fact?

Thanks for your input.
Yeah my diet is very clean. I follow a ketogenic version of the RPD. These days I eat, on a daily basis, about 400g beef, 100g berries, 6 tblsp raw dried broccoli or kale powder, and a few pieces of fresh turmeric and 200-300g beef fat, plus 2 capsules of Dr Rons astaxanthin supplement which contain salmon oil. Also about 2 liters of river water (I live in New Zealand atm, so have access to relatively clean rivers). Also one bottle of red wine (organic and preservative free) per week, which I just started doing a few weeks ago..
After a bit more reading I've decided to buy a zinc supplement. I'd read many times that zinc deficiency is often a culprit for acne. But I always dismissed it, because meat is a decent source of bioavailable zinc. However, I came across an old post written by Cherimoya, if my memory serves me right, about zinc being highly antagonistic with copper. This switched on a light bulb in my head, because I've always eaten quite a lot of liver, and even went through a period where I ate about half a pound of it per day. Liver is very high in copper, so I figured this could have had a negative impact on my zinc levels. Liver is also very high in iron. And I believe that iron and zinc compete for the same uptake channels in the body, perhaps further depleting my zinc. Blood tests already confirm that my iron (ferritin) is very high. That's why I do not currently eat organ meats, but I will reintroduce them sometime in the future and just make sure that I don't go overboard on them. Furthermore, apparently zinc acts as a DHT blocker. So hopefully I'm putting the right pieces of the puzzle together here.
I'm not one for opting in for supplements in general, but I'm allergic to shellfish, otherwise oysters would have been the way to go regarding upping zInc.

Did you incorporate those foods, that are mentioned in the conclusion, into your diet? Any noticeable effects?

I've had to get a medical exam (16th Aug 2017) in order to extend my visa for New Zealand. I thought I'd post the results here for anybody who is interested in blood work etc.
I've now been following a RPD for nearly 7.5 years. The last few years have been VLC with protein counting for about 35-40% calories, and the last 11 weeks I've been pretty much zero carb and in nutritional ketosis with fat making up 85-95% of calories. I was fasted at time of examination.

Creatinine: 77 umol/L
eGFR: >90 mL/min/1.73m2

Haemoglobin: 139 g/L
Haematocrit: 0.43 Ratio
MCV: 83 fL
MCH: 27 pg
Platelets: 252 x 10e9/L
WBC: 6.5 x 10e9/L
Neutrophils: 3.5 x 10e9/L
Lymphocytes: 1.6 x 10e9/L
Monocytes: 0.8 x 10e9/L
Eosinophils: 0.5 x 10e9/L
Basophils: 0.1 x 10e9/L

HbA1c: 35 mmol/mol

Chest x-ray: heart size and contour are normal. Lungs are clear.

Urine analysis: no blood, sugar, or proteins detected.

I will be going to Brazil, Peru and Ecuador in a few months. I do not want to be vaccinated against anything. Does anybody here amongst us RPDers have any reason to believe I should be concerned about yellow fever, or any other disease for that matter?

One more thing: I regularly ate liver, heart and kidneys

I was in the same situation as your boyfriend. I had an eczema-covered body. Now it has completely gone.

Here is what I did (no particular order) to finally get rid of eczema:

1. followed a high ANIMAL fat, low carb diet (no oils)
2. eliminated dairy and eggs, alcohol and drugs (i also never ate nuts. I very rarely ate veg).
3. sunbathed whenever possible (not to the point of burning). Supplement with vit D when not summer.
4. never strayed from the raw palaeolithic high fat low carb diet. If I did (eg. if i drank some red wine or ate some raw honey, or chocolate etc), any healing would be reversed and I'd be back at square one, due to having scratched myself all night.
5. eliminated use of all man-made chemicals, eg washing powders, skin creams, body care products etc)
6. got an earthing bed sheet
7. removed mercury fillings
8. thought positive
9. learnt to be patient
10. avoided air pollution eg from traffic, whenever possible.
11. used an air humidifier whenever the heating in the house was on.

I can't think of anything else right now.

My diet right now is zero carb. But your boyfriend will probably be fine to eat a few berries and avocados for example.

Where in the sheep did you find it???

Tapeworms should not be in sheep.  Only cysts.  Adult tapeworm should only be found in carnivores (humans included).

Maybe these are some kind of other worms??

Over the past couple of months I've eaten several wild kangaroos. I've seen tapeworms in at least two of them. I was quite surprised to find that even the liver of one of them, which looked like a very healthy liver on the outside, was chockablock full of tapeworms. Pretty much every hole/vessel in the liver contained tapeworm.
I think it must be very normal for animals to contain parasites, and I think it would have been very normal for Palaeolithic man to have parasites. Nevertheless, I couldn't bring myself to eat the liver that was full of tapeworms (fed it to dog lol), however I have eaten one that only had one or two tapeworms in it (which I removed), with the knowledge that I would probably end up ingesting tapeworm or cysts that I hadn't seen.

Fish and meat. I can't imagine anyone on a paleo diet being short of sulphur, except maybe those few individuals who choose to eat about 90% of their calories from fat.