fructose turns into fat when sugar is low in the liver. I also felt a bit sluggish after waking up in the morning and eating fruit. It seemed like it was turning into fat and I felt slower metabolically. Too much sugar.. does not feel good.
maybe fruit is only good on the go and for short bursts of energy. but for people who don't have time to exercise much it's better to take something that is low glycemic grain, and more complex sugar. perhaps like barley.
and yes,most monkeys do have a belly. It might be natural for them though to have a belly so most wouldn't call it "fat" but a belly I've seen on most of them. Except for maybe the small ones but still they can have a protruding belly.
Humans developed a mutation to survive periods of famine by converting fructose sugars to fat in the liver when fruit is found.
Hm well my first thought is that no, I don't think fruit is a good choice for weight gain/fat. I reach for fruit as a snack (for water content and quick satiating), and if it is winter & my favorite fruits aren't in season I will get a bit "eh" about apples and more apples.
Like you ghost, I don't care for all the sugar anymore and thus am not interested in trying to live on mostly fruit. Doesn't make me feel good, I'd rather eat dark greens all day long... and I do :)
I don't care what "early humans" ate--it was arbitrary in any case, and I don't try to emulate any part of their violent, sick lifestyle, either. Fat is what causes me to gain weight--you will likely feel a bit different as you change your diet, but this doesn't mean that fruit is turning into fat in your liver.
Australopithecus anamensis may have "preferred" these foods (the tooth analysis doesn't show preference, only what these early hominids were eating), but modern man did not evolve directly from Australopithecus anamensis. We have discovered the fossils of several species in man's evolution that existed after anamensis.
And by the way, there was a human species (I believe around the time of homo erectus) that lived on primarily tough foods like nuts, seeds, bark, twigs, and berries (they had very tough teeth with a large ridge on the top of the skull for stronger bite force). This species died out.
More important than relying on the diets of our ancestors (or even our current) primate cousins is that we look to our own anatomy and physiology. Based on that (e.g. long digestive tract, low stomach pH, dental formula 2/1/2/3, the fact that our bodies breakdown all food into sugar) it is pretty clear that humans have evolved to eat a fruit-based diet and certainly not a meat, green, grain, tuber, legume, or fat based one.
Also, here's a quote from an article on sugar by John McDougall:
"The process of synthesizing fat from sugar is known as de novo lipogenesis—the new production of fat. This activity is highly efficient in some animals, such as pigs and cows—which is one reason they have become popular people foods—these animals can convert low-energy, inexpensive carbohydrates—grass, say, in the case of cows and grains for pigs—into calorie-dense fats.5 However, human beings are very inefficient at this process and as a result de novo lipogenesis does not occur under usual living conditions in people. Thus the common belief that sugar turns to fat is scientifically incorrect—and there is no disagreement about this fact among scientists or their scientific research.5-8