1-Ehret is obviously non-scientific because there's no damn way to really prove him but by experience. You give him a chance or you don't.
2-Yeah, that's the point: too much poison in blood makes white cells neccesary to rush, therefore he aludes such color of skin to the constant overflow of these.
3-Lungs are the motor of pneuma, the blood is simply an alchemical way to carry this force in an acceptable way. The rest of it, you got it right.
4 & 5-He is not the only one who claims that fasting heals the brain.
7-Dandruff is the result of awkward efforts by the body to uselessly excrete mucus through skin cells. Like acne. Some other claim that dandruff is the result of inmune weakness at these zones produced by phlegm stagnant at lymph. >which is kinda likely
10-Eased, fed. Not caused. Read carefully. >but pretty much the same to any other sickness: muci make the way for germs to grow inside
About 11 and 12 I don't see why they are so unbelievable. And 13 is like 2.