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Comment by barbazoo | Hacker News Reader

That sounds really hard. Is the purpose of determining the amount of food so you can adjust the amount of insulin? Sorry, I don't know about the day to day of living with diabetes.

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Yes, diabetics need to precisely adjust their insulin intake in proportion to carbohydrate intake.

Also when figuring out how much insulin is needed for a given amount of carbs you need to factor in the type of carbs, your individual response to that type of carbs, what fats/protein/fiber you eat with it (fats and fiber tend to slow down the BG rise from carbs, protein can cause a rise when eaten on its own but can also slow down the rise from carbs), what time of day it is (I need around double the amount of insulin for the same food first thing in the morning vs in the afternoon), your mood, what else is in your stomach already, the weather (hot weather can greatly increase insulin sensitivity), your current fitness level, what physical activity you have done over the last day or 2 and what you will do over the coming hours, where on your body you inject, if you are fighting any illness…

For my wife (type 1 diabetic), physical activity is the big one that throws off her calculations as a walk in a hilly area makes her blood sugar drop like a rock. Of course she always has something with sugar with her but then she has to figure out how much to consume.

Hill walks are particularly challenging for me too. I can do rowing or weightlifting with my sugars staying fairly stable or rising if it's really intense, but something about walking steadily up a gentle slope makes it drop massively. There was some interesting research a couple of years back on how exercising the calf muscle is particularly effective at lowering BG, perhaps that has something to do with it https://pmc.ncbi.nlm.nih.gov/articles/PMC9404652/

Yea, as a T1D myself the amount of insulin I need is massively different from days I'm arguing on the internet compared to days I'm up doing physical exercise. Things get concerning really quick when you're a distance from anything and your glucose starts dropping.

When you eat, depending on the glycemic index of the food you're consuming your blood sugar starts immediately going up and can quickly peak at dangerous numbers if the food is sugary.

A diabetic will want to take dose of insulin a bit before eating in order to send their blood glucose level on a lowering trend. If you dose it right the two waves semi cancel each other out and your blood sugar goes up some, but hopefully not a huge amount.

If you get the dose wrong, it drops dangerously or rockets up and you have take correction doses.

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