So after following the day-long debate, but not being able to respond, I'll just put my two cents in here.
I live in an area where there is no wild fruit. I'm an avid outdoorsman and have yet to come across anything that remotely resembles fruit in this area, even if I don't know what it is, it's all pretty much grass and trees. So there's two conclusions I can draw: 1- fruit is not abundant in this area so if I were to adapt to it I'd have to eat mostly animals. 2- whether or not it is beneficial, evolution is about change, and the change that needs to occur to survive in an area.
I have many reasons for doing VLC/ZC right now:
-Seasonal changes: it's getting to fall and about the only fruit left is apples and pears. Nothing can be found wild so I choose not to eat domesticated fruit right now.
-Previous health issues are going away being on ZC: my teeth enamel in growing back, they are becoming stronger, acne is clear, all symptoms that showed up immediately upon consuming carbs in any form, including raw local honey. My energy deteriorated with carbs and on zero-carb I feel like a warrior, going for most of the day with no desire to stop and watch tv as I previously wished to. Not to say I'm over-working myself, rather that I'm being productive for my day, with many activities being sit-down (music, reading, conversation, etc.) Also my desire to be social is returning to what it was in high school, when I felt great.
-I come from Scandinavian and Slavic heritage, both cold climates. Who knows how many generations this goes back but let's assume for a moment that within the realm of unprocessed foods one must adapt to his environment quickly or die. To adapt to cold climates one must consume fat and very few carbs; it's all that nature has available and in fact provides an advantage for that person. I notice on my highest fat days I struggle a little in the heat but can drench myself in a cold shower or sit in the car with the AC full blast, feeling cold but it doesn't bother me. In fact, it's almost enjoyable to live at a refrigerated temperature of 50-60 degrees F, or about 14-20 C.
-I have always had a disposition towards meats and fish, again possibly Scandinavian heritage.
-Sweets have been my addiction, struggling to not eat them day in and day out. With ZC, I don't feel that pull anymore and with a few bites of carbs I feel a pull to continue consuming even though I know it's unhealthy. They make me sick so I need a break.
-Sleep is better. When I was young I was always noted as the first to bed and first to rise. Looking back I was just sensitive to the natural cycles of the day and enjoyed following them. From 13 yrs. to just a few months ago of age I have had sleep difficulties that are being sorted out again by being ZC. I am more likely to be in bed by 10 and wake up naturally at 6-7. This is not consistent yet but I am feeling more rested and more energetic overall, which tells me something good is happening.
As stated earlier, I have no intention of living my life in a zero-carb state. It is an experiment I need to conduct to figure out the best carbs for me and how to tolerate them without a loss of energy. If that means I must live in a ketogenic state where most of my energy comes from fat, so be it. If the way I feel now continues (not likely, everything changes) I'll continue what I'm doing. It's the first time in my life I've felt this good.
As far as scientific stuff goes: babies live in a ketogenic state, eating high fat and cholesterol and doing great. The land mostly provides those macronutrients year round, fruit being seasonal except in tropical places. Yes, I know the stuff about instincto's talking about high fruit areas year round. That is not commonplace nor does it align with evolutionary theory or even practicality for where I live. Otherwise I'd be consuming only domesticated fruit and I'm sure the instincto's don't approve of domesticated fruit. Also, if the instinctos truly had their alliesthetic response the same as our ancestors, why do we not hear them laying claim that grazing on bugs is the most instinctual way of hunting for food? Why work hard at killing a deer that's so fast and requires great spear skill when we can eat these lovely maggots crawling all over the tree? I'm 3 months into raw paleo and as I can see myself maybe in the future attempting bugs, I currently have no interest. I'm already deemed weird enough and don't want to lose any more friends over this
I would like to be more wild in my approach with food; hunting more frequently. I can only imagine how yummy a dove or quail or deer or bear is eaten straight from the wild. My nature may be full of bugs but I'll let the lizards eat the bugs and I'll eat the lizards.