I've been trying a high starch diet recently and I really like it, it's just my digestion is really bad now. My staples are white potatoes and fermented wheat porridge. Cutting the wheat alone isn't enough, and it needs to be something that supply's a pretty good micronutrient profile(it would probably be over 50% of calories). Any suggestions?
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The only truly nutrient dense vegetable which is comparable to potatoes (in calories, about 750 per kg) is sweet potatoes/yams. There are other tropical roots such as manioc, but maybe not commonly available where you are. Squash and parsnip may give you 4-500, after that, you get in 300 territory with beets, turnip, cabbage, onions, string beans, etc. Avocado has a lot more calories but they are mostly fat.
You could try sprouting things, and indeed I have always enjoyed sprouted chickpeas(spear is about 1/4 inch, after two days soaking with water changes), stewed with vegetables and tomatoes, though these days I don't eat them (maybe I should). If you have a garden, fresh shelled beans and peas freeze beautifully, and are a lot lighter on your system than their dried counterparts. These pulses are all much more nutrient dense than any grain. Finally there are chestnuts, if you can find them. I have two trees and we gobble them up, roasted for dessert. Store bought chestnuts are vastly inferior though.
You're not going to get across the board nutrition from a single food. Eat a varied diet (seriously, this is one of the most important tenets of paleo!) 8 ounces of sweet and white potatoes each, 2 cups of rice and 2 bananas is more balanced in nutritional profile than 6 cups of white rice made with broth.
White rice and vegetable broth should be pretty easy to digest and nutritious.
I often go with white rice. No stomach issues there, but not much micronutrients. Look into different colored / sweet potatoes, yams, sago, taro, plantains.. breadfruit! Add some fermented vegetables for easier digestion and added micros.
Purple taro sounds pretty cool. I'd try to get a range of starches rather than a diet of 50%+ white potatoes and wheat.