Your post really ressonates with my experiences. I got a few cavities and sensitive back upper teeth after a long time with whole grains and potatoes. I really Think it is hard to get enough zinc, calcium etc to make up for the antinutrients that inhibit their absorption. Currently eating a lot of red meat which helps with teeth sensitivity. High fiber foods also give me sensitive teeth. Orange juice + meat for a few days make my teeth feel better.I seem to do really well with homemade spelt sourdough bread, but the jury is still out. I have seemingly random energy crashes and will have to do more experimentation, because I've also gotten these crashes even while avoiding starch completely, so I don't think it's reasonable to attribute it to starch.
Anyway, I use milk kefir as a starter, simply add sea salt and filtered water as well, mix up and ferment for 24 hours before baking in a dutch oven greased with hydrogenated coconut oil.
Spelt being a non-hybridized ancient grain is one thing. Fermenting is another. If we look at grain consumption we have to consider that historically, grains were fermented. Or in the case of corn, nixtamalized -- cooked in calcium hydroxide, which makes the niacin available and also makes the proteins more digestible.
Starch is easily stored and extremely cheap. For convenience, food security and affordability, it's pretty much impossible to beat.
Most of my starch is: organic, non-fortified quick oats, masa harina (in the form of porridge or atole), and homemade sourdough spelt bread.
It would make sense that fermentation significantly pre-digests starch and would therefore leave a lot less potentially undigested when we consume it. And this is also the traditional way of preparing many grains.
Iron fortification of grains is definitely an issue, and one would be hard pressed to find long-term studies on starch that disqualify iron-fortified grains. How many people in any studies on grains are ONLY consuming fermented grains prepared via traditional methods?
However, there may be many pitfalls. I have two dental cavities, the first I've had in over 12 years, after a year or so of eating a lot more starch. Perhaps starch lends itself to sticking to the teeth more, perhaps it's the phytic acid from the oats/masa depleting mineral stores. Who knows. But of course that has concerned me and has made me reconsider adding all this starch into my diet, but I've simply upped my dental care routine for now.
For the record, I have lost about 20 pounds while upping starch intake significantly, and lowering fat intake. 205 pounds at 5'11", down to 180-185 pounds.
Basically I stopped eating cheese and chocolate completely, only use coconut oil on rare occasions, and regularly have spelt sourdough bread, oatmeal with bananas and raisins, and masa harina with hot sauce and salt for flavor. I also stopped fruit juice but still regularly consume whole fresh fruit, such as blueberries, bananas, grapes, and apples. For meat I'll have just about anything. I'm on the fence lately with red meat, as I've been having a lot of it lately, but I'm not so sure that's a great idea because of the high iron content.
The sourdough, for the record, came later into the game. I found out I had cavities when my starch intake was almost exclusively quick oats and masa harina. I would imagine the reduced phytic acid from fermentation would be beneficial for mineral absorption, and just naturally, I've been craving the sourdough more than all other starches for the time being, to the point where I only have been having small amounts of oats and masa.
I may have a potato allergy. Hard to say. I do seem to be extremely sensitive to solanine or any other glykoalkaloid toxins in potatoes because I frequently get a very bitter, metallic, and burning sensation in my mouth when I eat potatoes of any variety. Thoroughly peeling the skin helps, but not always. Depending on how long they were sitting out and how many toxins they started producing, they can be simply inedible to me. I've had other people try the same potatoes that were giving me horrible reactions and they tasted fine to these people, so an allergy is certainly possible.
Otherwise, I'd probably have a bunch of potatoes. Very high quality nutrient profile, and very satiating. Unfortunately this possible allergy makes regularly consuming potatoes impossible for me. So far the sourdough spelt is the winner for me. I am not opposed to the idea that eliminating all starch may be beneficial, but I have lost a lot of weight on high-starch and lower fat, so the idea that starch by default makes you fat does not ring true with my personal experience.