An "Eden" diet: And God said, Behold, I have given you every herb bearing seed, which [is] upon the face of all the earth, and every tree, in the which [is] the fruit of a tree yielding seed; to you it shall be for meat.
That is a strict vegan diet, seeds, fruit & nuts; could we be healthy & active - & long-lived - on such a diet today?
Typically seeds & nuts provide 2000 kcals per 400 g
protein: 80 g - 320 kcals
carbohydrate: 40 g - 160 kcals
fat: 200 g - 1400 kcals
fibre - 80 g - no digestible calories, but contribute to the total measurement - 2,000 kcals.
Most fruit contain 10% carbohydrate - as sugar - & would give a needed energy boost.
I consider such a diet would provide all we need.
OTOH the modern diet, comprising refined carbs, including sugars, but restricted fats means getting most of our energy from refined carbs, which is NOT what God provided. The post-diluvian addition of meat would provide additional protein & fat but NOT carb.
I've got very interested in diet as a diabetic. I followed the recommended "starchy carb/low fat/low sugar/ low salt" diet for 7-8 years until serious complications set in - extreme tiredness, leg muscle pain, & the beginning of retina damage. I then changed to a "low carb/higher fat" diet & this reversed ALL the complications. Four years on I am healthy, active & free from complications.
About 1/3 of my diet is nuts & seeds, in the form of ground almonds, coconut flour & milled flax. I also eat eggs, dairy, meat & fish, plenty of vegetables (NOT potatoes), limited fruit, plenty of tea & water, a multivitamin/mineral supplement.
Not an Eden diet, not a "caveman" diet, but more of a "hunter-gatherer" post-diluvian diet. My blood glucose is well-controlled.