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One of my uncles was diabetic and he had bittergourd juice. Tough, actually impossible for me to drink
Bittergourd juice is quite foul - however, bitter gourd makes an absolutely wonderful curry - think about how good aubergines can be in a curry, and you are on the right idea; aubergines can be quite bitter. Bitter gourd can be purchased in most of the asian supermarkets here.
On topic, diabetes friendly food that will help out with somebody who feels sick eating food, or has a bit of a jaded appetite generally - soup. Sounds obvious and silly, but works every time. Propüer soup though, and only clear soups. Boil up a shitload of beef bones with some garlic, onion and ginger. Simmer for several hours, and strain. What you have now is basically beef tea - a high protein liquid, that will settle the stomach, make you feel a bit more hungry, and work wonders. Go vietnamese style, add a few rice noodles, some beansprout, a few wafer thin pieces of beef, and a bit of mint or coriander, and you have a good little dish that should sit well in even the most unstable of stomachs.
Even a good vegetable stock will go down well, but the added benefit of the protein that you get in a decent beef stock honestly helps.
I never read much about the nutritional content of food to be honest, but I know my fodder, so fortunately cooking to a particular set of dietary rules is not really that hard for me
With diabetes, the focus is always on sugars - but we have found that the most beneficial diabetic-friendly diet is simply to use NOTHING from a can, packet or tin, and make sure most of the carbs are "dinkel". Any oko shop here has dinkel pasta and shit like that. Its alot of work at the beginning, cooking EVERYTHING from absolute scratch, but lets face it, thats pretty much the case when cooking anyting in Germany (unless you go to the
Karstadt food hall thing with a gold card). The forzen foods here are abysmal, so using fresh meat and veg is the best way forward anyway. If a sweetness is required, you just have to coax it out of the veg - and they are full of "good" sugar man. The problem is that the SECOND you pick a vegetable, the natural sugars start to turn to starch straight away - so you really need to either grow, or source really good vegetables. Making any tomato based dish using the insipid red bits of crap that they sell as tomatoes in
Aldi is never going to be easy, but there are ways.