I think that the null hypothesis has to be based on the actual studies that have been done, not on poorly founded hypotheses about what our ancestors did and did not eat in the ancestral environment.
Fruits are probably only an issue for those of us trying to lose weight. However most of the fruits we eat have been bred over hundreds of years or more to be larger and sweeter (i.e. contain more fructose) than natural fruits. And some fruits are higher in starches than others, so if you’re trying to lose weight and failing, it’s worth cutting these out. Not all fruits are equal here. Berries are likely better for you (or at least less bad) than apples and bananas, for example. Again, this is not not really worth worrying about unless you want to lose weight.
I suspect a low fat diet actually does not win out over a standard diet, because low fat diets replace fats with carbs. Even worse, in practice they replace fats with simple carbs: pasta, bread, and the like. Low fat sweets are the worst of all because they replace fat with sucrose. Sugar and other simple carbs (and maybe all carbs) affect how your body stores and releases fat. The real story is much more complex than simply eating less and exercising more. You have to consider how and why our bodies produce and respond to insulin, glucagon, and other hormones that control fat storage and metabolism.
I think that the null hypothesis has to be based on the actual studies that have been done, not on poorly founded hypotheses about what our ancestors did and did not eat in the ancestral environment.
Fruits are probably only an issue for those of us trying to lose weight. However most of the fruits we eat have been bred over hundreds of years or more to be larger and sweeter (i.e. contain more fructose) than natural fruits. And some fruits are higher in starches than others, so if you’re trying to lose weight and failing, it’s worth cutting these out. Not all fruits are equal here. Berries are likely better for you (or at least less bad) than apples and bananas, for example. Again, this is not not really worth worrying about unless you want to lose weight.
I suspect a low fat diet actually does not win out over a standard diet, because low fat diets replace fats with carbs. Even worse, in practice they replace fats with simple carbs: pasta, bread, and the like. Low fat sweets are the worst of all because they replace fat with sucrose. Sugar and other simple carbs (and maybe all carbs) affect how your body stores and releases fat. The real story is much more complex than simply eating less and exercising more. You have to consider how and why our bodies produce and respond to insulin, glucagon, and other hormones that control fat storage and metabolism.