Hey, sorry if this has been asked before, but I've been repeatedly experimenting with different foods paleo and non-paleo to see how they make me feel, and sure enough I feel best on mostly animal products and few veggies.

Except that then I need animal fat primarily as a fuel source.  I starting eating a lot of cooked beef fat (pork makes me feel bad and naseous almost immediately), and it felt like a great natural energy source, but after half a day I starting feeling sick to my stomach even though my head/brain felt the healthiest.  This was also grass-fed beef fat from Whole Foods so I trust it's quality for the most part. I tried this multiple times on different occasions, but I keep getting to that naseaous place.  After one full day of mostly animal fat I felt like I was gonna puke and had bad diarrhea.

Has anyone had a similar experience?  Do I need to go full raw animal fat to even be able to stay on this type of diet?  Or do some people do fine on a lot of cooked animal fat?  Fat definitely makes the rest of me feel the healthiest but this stomach ache is too much.  Thanks.