I threw everything I thought I knew about protein instake out the window. Things such as X# of grams per pound of bodyweight, only absorb this much per session, etc. I follow the LeanGains approach daily and often throw in a 24 hour fast once every couple of weeks or so. I am currently 5'10 193 LBS. I lift heavy (fasted), do HIIT several times a week and throw in some light cardio on rest days (it's relaxing and meditative for me). At first I was really scared to lower protein intake because of a muscle loss fear and what I've lived by for so long. If I didn't get over 200g of protein per day I was completely stressed out. Now, I typically consume 100-130g protein per day split between two meals. Fat intake is probably 60-70% of my total caloric intake in the form of grass-fed butter, coconut oil, and grass-fed animal fat(organ meat, pemmican, etc.). My personal results have been increased strength and muscle mass, fat loss, and less stress about food consumption. Here is an article that has some before and after pictures to alleviate fears of not putting on muscle eating this way. If you have more in-depth questions, I'll be more than happy to go into more detail.
Remember everyone is different, the only way to know what works for YOU is experiment! The joy of self-discovery is a cool thing, don't be afraid to try it!