Honestly eating this way I didn't feel any different from standard keto. Energy remained constant and hunger was non existent. Starting in the evening of the 3rd day I had some mild flatulence which continued for the remainder of the trip. I only had water or decaf green tea to drink. Every day included 10+ miles of paddling and one or more hikes from 2 - 12 miles in length.
My dad subsisted on 2 keto peanut butter cookies for breakfast, one apple, tangerine, plumb, serving of bacon jerky, serving of cashews for lunch and the same tomatoes and beef for dinner. The fruit is not part of his diet back home. Low carb high fat paleo has done wonders for his health over the last year. I'm so proud.