I understand the first bit, in fact my mother is wheat-intolerant, but nowadays there are DROVES of healthy people that are insisting on gluten-free just because gluten-free is the food of the year for gullible health nuts.
As for the second bit... Bread, mostly wheat bread, was absolutely essential in the diet of most of humanity for how many millennia? If that constant exposure to wheat didn't cause food allergies why is it doing so now?
Because we keep those with allergies alive, instead of them dying or being ritually killed for either demonic possession or as a sacrifice to the gods.
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This is especially true if it's the main source/staple of nutrition, as an allergy to it would almost surely result in a death. Thus, a natural self-selection system was established that prevented, for a great while, any kind of growth in the allergy-susceptible (for there must be a genetic component to it, at least to some degree, I'd reckon).
Also, in no way did grains contribute anything more than a minimal portion of our nutritional intake, if at all, when our ancestors were just barely figuring out how to do much of anything in the wild. It's truly not in our genetics to actually consume it daily; it's sustenance for when things are pretty bad, but doesn't provide much of anything useful, save for quick energy if it can be utilized.
And a lot of "dietary fads" are not really fads at all - the ignorant among us only label it like that because quick diets have come and gone over the years, but a lot of the new concepts on the scene are not actually diets, but a nutritional lifestyle change (you can still be a glutton but change what you stuff down your gullet
😉). This is brought on by a shift in nutritional and exercise science unlike anything we've ever had before - what we know about the world around us and how our body interacts, at the molecular level, to what we do and consume, is changing our outlook on what exactly we need.
And some of us consider it a good thing to try and limit eating things which provide us nothing of value, and focusing on things that are either "less evil" or, if possible, entirely on things that only have a positive nutritional value.
My standpoint: it's all about efficiency. Eating the most effectively, and conducting exercise with the most reward/least time.
Honestly, my go-to "belief" is the combination of Paleo + Crossfit. But I neither participate in a crossfit-dedicated training regimen, nor stick to a Paleo-inspired diet. But I take the concepts to heart and try to incorporate much of the ideas as possible. I can still significantly cut back on carb intake, as an example. I like my grains too much, but, and this is the worst part, I still enjoy them far too much.
I consider Paleo + Crossfit to be "the most efficient" because it's calling upon every genetic memory we have as a species. Focusing our diet and athletic inspirations on what our body experienced when "growing up" will provide for the best health and fitness we can probably provide. We can boost that in various ways, obviously, but the best starting point is THE starting point.
Most people just don't want to "give up" what we have available today, because, we being the almighty humans that we are, the best of the best, should be able to do whatever we damn well please, amirite or amirite?
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Some hop on these bandwagons in a fad-like fashion, sure, but many actually follow the original reasons these things come to fruition. Science, it just works.
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