Most of what you read about coconut oil is advertising that takes research out of context and deliberately distorts it. I haven't seen references to blood sugar, but that claim is most likely based on the idea that a diet that's slightly higher in fat and lower in carbs helps *some* (not all) diabetics (not people without diabetes.) It's not applicable to everyone and it's only talking about fat in general, not coconut oil.
Coconut oil has mostly saturated fat. We do need a small amount of saturated fat, but most of us get that necessary amount without even thinking about it. There's saturated fat in meat, dairy products, eggs, and some oils. If you're vegan, you might need a little more than you get incidentally. If that's the case, then cooking beans or rice or veggies with a tiny drizzle of coconut oil might be nice.
There's also some slight evidence that coconut oil *might* be a tiny bit healthier than other *saturated* fats like lard or butter (although it's far from proven.) If you already cook with lard or butter, it probably won't hurt anything if you switch to coconut oil for those purposes. But there's no demonstrated benefit to adding coconut oil if you don't already use saturated fats.
To figure out whether you're getting enough (or too much) saturated fat already, add it as a nutrient to track in your nutrition log. Look at the number of grams you get in a day. Then look at your total calories for the day, and take off the last two digits. If the number for saturated fat grams is bigger than the first 2 digits of calories, you're getting more saturated fat than you need. (In other words, if you're getting 20 grams of saturated fat when you only eat 1400 calories, you probably should cut back.) If the number for saturated fat is less than half the first two digits of calories (for example, 5 grams when you're eating 1400 calories), talk to your doctor about whether s/he thinks you might benefit from a little more. S/he will probably say no. (Or, if you're mathematically inclined, calories from saturated fat should be no more than 10% of your total calorie intake.)
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