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Comment by jrvarela56 | Hacker News Reader

I did and would recommend. It shows you the impact of foods in your blood glucose and made it easier to convince myself and change my behavior.

Some lessons I got from using it for 2 months (these are personal, some should apply to most people):

- Plantains cause a BIG glucose spike (I thought they didnt; in my case even more than pasta or rice)

- Walking ~10min after a meal removes the glucose spike of even pretty large meals

- Intense exercise before (duh) removes the glucose spike of any meal, even with big desert/ice cream

- Eating veggies (or taking fiber pills) before a meal removes the glucose spike of most meals

Some of these things I had read about online, but seeing the impact live on my own blood glucose made the lessons stick.

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Why do you feel you need to change your food intake, and how do you interpret your CGM results? If you don't have a form of diabetes it doesn't really make a difference. Your glucose will go back down to 85 fairly soon.

Family history of developing type 2 diabetes. I take the CGM results as a sign of my pancreas having to pump out insulin to counter the blood sugar. From what I understand, consistently exceeding certain level (110/120? forgot) for prolonged periods (an hour was the warning given by the device) eventually leads to insulin resistance.

I see, sounds reasonable. I definitely learned a lot about how my body responds to different foods and other reasons glucose can rise (besides food, glucose also rises in response to metabolic activity).

Which CGM are you using? I have a Dexcom, which has configurable alarm thresholds. I have type 1 diabetes. Generally I try to avoid being over 140 for very long, and over 200 is considered dangerous. My Tandem insulin pump used a non-configurable setting of 110 as the level it tries to maintain by increasing or decreasing insulin dosages.

I used Levels, which integrates to Librelink from Abbot.

Levels just puts a nice UI on top of Librelink, like scoring meals and days, finding associations between meals and giving you tips.

I stopped using these because they are expensive (at least 100 per month if I only used Librelink, think it depends on country as my moms buys hers in Colombia not the US) and I was just looking to learn about certain meals/timing/etc.

I’ve put on weight and I find the cgm to be a way more objective and practical metric than calorie counting. It’s simply hard to consume enough low GI foods to put on weight.

There are certain foods that my body seems to process poorly. My blood glucose spikes as much from crackers and rice as it does from more traditional sweets. My heuristics for other foods that I assumed were sweet (often fatty foods with mild sweetener) were also wrong. And I’m not weighing everything, counting calories, etc. I just tap my phone onto the device a few times a day.

Other things have also been surprising. I smoke hookah fairly regularly and found that it raises my fasting blood glucose by almost ten points (80 -> 90).

I find it’s an easy North Star metric with a single exception being intense physical activity which releases glycogen stores.

There are other factions within the community that believe that blood glucose spikes are responsible for things like abdominal fat storage and you’ll see that they continually try to game the number with things like nut consumption and drinking vinegar. This seems less useful to me.

Have you tried taking a fiber supplement before meals? If you're still using the cgm I recommend you try and measure - I was impressed!

I noticed the effect with salads and figured the fiber could help in a similar way.

Fiber and protein do slow down carb absorption, but for me fat content makes the biggest difference.

I have type 1 diabetes (actually LADA) so I keep a very careful eye on my glucose.

Definitely the foods that make it rise the fastest are starchy vegetables like potatoes and grains. Fat plays a major role in absorption - a potato by itself causes a quick spike, while if I add cheese, it takes about twice as long to fully digest. Protein and fiber slow things down, too. Generally sugar causes a spike that goes down quickly compared to other carb sources.

Many people with t1 find that aerobic exercise like a brisk walk lowers glucose in the short term, and it even has an effect for a day or two. Often people report that intense anaerobic exercise like weightlifting raises glucose levels.

Insulin definitely plays a role in fat storage (that’s one of the major things it does as a hormone).

Correct me if I'm wrong but I feel that your comment is trying to connect a "big glucose spike" with the cause of diabetes. They are not connected. Millions of people are eating apples, grapes, plantains, strawberries, raspberries, etc every year without issue.

To tell people to avoid these healthy foods is not backed by the science. And so what if it raises your levels temporarily? Running raises my heart rate and blood pressure. Does that mean I'm about to die?

That's not what this person is saying. "Big glucose spike(s)" actually are the cause of diabetes. The more regular spikes a person has, the more resistant to insulin they become, which is where type 2 diabetes starts. The point of the comments I believe was just to say that certain foods cause different responses in different people. If plantains cause a large spike in a person, I would say that person should probably not eat them every day all the time.

> "Big glucose spike(s)" actually are the cause of diabetes. The more regular spikes a person has, the more resistant to insulin they become, which is where type 2 diabetes starts.

People who don't have diabetes or pre-diabetes spike. But I hardly see a body of work that suggests that everyone is at risk of diabetes.

> If plantains cause a large spike in a person, I would say that person should probably not eat them every day all the time.

People from South America eat them every day and they aren't linked to diabetes as far as I know.

> People who don't have diabetes or pre-diabetes spike. But I hardly see a body of work that suggests that everyone is at risk of diabetes.

The problem is consistently exceeding a certain level of blood sugar for extended periods of time. I think this is how you develop insulin resistance.

> People from South America eat them every day and they aren't linked to diabetes as far as I know.

I am from Panama, where we eat a lot of plantains. That's why I decided to test because it's a staple and I would have never put it in the same category as other carbs (bc I thought they had enough fiber to counter).

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