Diabetes topics worth the time

I’m new here and certainly feel the need to avoid causing needless strife. The welcome vibes have been great yet I’m aware that our long history as humans and surviving in tribes still pertains and the sense of the “other” always rides just below the surface.

With 42 years of living with diabetes, my resume is deep enough to comment on many topics. Yet I also realize that readers here share in long lived experience and likely have come to different conclusions. But that’s what forums are for: airing it out, exchanging perspectives, and hopefully learning something useful.

Consider potential topic choices:

  • The numerical assessment of my diabetes data
  • How my diabetes technology helps me
  • How my way of eating permits “normal” blood glucose levels
  • How to socially negotiate with your endo to maintain good access to vital Rx’s
  • Why the standard target range of 70-180 mg/dL feels patronizing to me

The numerical assessment of my diabetes data

I’m a diabetes data geek and I make no apologies. I look at the Dexcom Clarity website and the Tidepool site on a daily basis. I surprisingly discovered many years ago, that the mere daily observation of this data mysteriously fueled the long term motivation to make it all work for me.

Yet I know that this topic can easily be dismissed by readers as being a trite exercise in ego-stroking. “Look at my 24-hour no-hitter with tight time-in-range limits!” My motivation truly is one of sharing with others diabetes success as way to inspire them to the same experience. Getting the tone right is critical and for me it’s still a work in progress!

How my diabetes technology helps me

I’ve used a pump for 39 years, a CGM for 16 years , and an Automated Insulin Dosing system for 9 years. And I believe that I’ve found every way to break these gadgets but I haven’t killed myself yet! My experience is deep and I have much to share but fear coming off as pedantic, a self-appointed teacher propped up behind a podium. I’m also aware of many readers here who share my deep experience but don’t necessarily share the lessons I’ve learned.

I can reveal statistics and graphs that support my expertise but there’s always the danger of that being perceived as an ego-exercise.

How my way of eating permits ‘normal’ blood glucose levels

This topic represents a true minefield for a diabetes writer. It’s a simple truth that no-one likes being told what s/he should or should not eat, me included! Sometimes, even the simple suggestion of altering one’s way of eating creates an instant tempest.

The hard truth of diabetes, however, is that it is a breakdown of our fundamental ability to metabolize nutrition. We’re forced to inject insulin peripherally (much less than ideal) and balance out the timing and amount of nutrition we consume. It’s also a stubborn fact that carbohydrates comprise the largest driver of insulin needed. We must address this reality or go home!

This explanation seems simple enough to me but I’m embarrassed to admit that it took me 28 years for the practical reality of that to sink in. I finally took action in 2012 and started to limit carbs in my diet. I lurked for two years at TuD watching the “carb wars” evolve before I acted. I don’t believe I would be writing this today if I hadn’t acted then!

We diabetics are touchy about how we eat! In fact, all people are touchy about how we eat!

How to socially negotiate with your endo to maintain good access to vital Rx’s

This point, at first, seems non-controversial. The disparity between our deep lived experience and the endo’s common inability to understand and respect our depth of knowledge creates this diplomatic challenge. However, not all endos are like that and I can see the immediate defense coming now.

For me, I’ve had to pick and choose my words carefully, four times/year for 42 years! It’s not really their fault; no one who doesn’t live with insulin dependent diabetes all day, every day can truly get it.

Why the standard target range of 70-180 mg/dL feels patronizing to me

I wrote a post at TuD several years ago with this topic. While it was provocative, it did not endear me to everyone. I lost a few valuable relationships over that piece.

I value normal blood glucose levels. In any scenario, I think that setting valuable targets, aspirational ones, is how to play this game well. I know why the clinicians set the more moderate glucose targets. People with diabetes have a hard time aiming for better. Normal blood sugars seem hopelessly out of their reach. And the mind game is important!

What these clinicians need to acknowledge is that a significant minority of people can and do shoot for normal blood glucose. Check out the FB community TypeOneGrit. You’ll never hit a valuable target if you don’t aim at it first!

Anyhow, I’ve given a good deal of thought about what to explore in diabetes topics. The challenge feels daunting to me as I’d like to earn/keep your respect. Let me know your thoughts.

10 Likes

These are all definitely topics of interest.

What is also interesting is the overlap of almost every topic. Nothing in D life is truly siloed.

Another worthwhile thing to explore is the constant change being forced upon us. For example, the Dexcom G6 may be phased out. What if they end Dash, what will that do to (most) Loopers? Why did they discontinue Levemir, which was so unique in its delay mechanism, and what can be used to replace it?

You have earned so much respect from your time on TuD and all your posts. People who have spent time there already know your credentials!

4 Likes

I love it! You can always start individual threads within those areas and I’m sure you get lots of input from others into their experiences as well. <3

5 Likes

What levels do you aim for?

2 Likes

I prefer being >70mg/dl and <140mg/dl. I’m not able after being on prednisone and then the stress of my wife’s stoke, decline and death. The last 6-8 months have been unkind.

4 Likes

I target 65-120 mg/dL. I understand not everyone can do this but many can.

2 Likes

@CarlosLuis, my heart is with you. The combination of steroids and stress from the loss of a mate is hard on anyone. You’ll get back to better blood glucose control in due time.

4 Likes

Thanks for the kind words as to BG
I’m slowly getting there.
Back on topic, the one complaint I have with T:Slim is insulin duration is hard set at 5 hours. That needs to be less for me , maybe 3.5 or 4. It may be because of high insulin resistance even with exercise. The change that allows extended blood up to 8 hours has helped. It use to be 2 hours which was less than useless for me, 4 hours is right

2 Likes

I use DIY Loop v3.8.2. I do not know how the T:Slim software is set up. Loop, like your T:Slim, has a fixed insulin duration (aka duration of insulin action or DIA). Loop is fixed at 6 hours. The reason Loop gives for this algorithm design decision is that the DIA determines the insulin on board (IOB) value that is used in determining whether to add or subtract or stand pat with its dynamic insulin delivery. This is at the heart of Loop’s algorithm.

Six hours is the physiological duration of “rapid acting” insulin analogues like Apidra, the insulin I use to Loop. That six hours of duration is described by a curve where much of the action is front-loaded and it has a long low tail. While that tail is long and low, do not discount its effect! In the past, when I could adjust DIA, I have been bitten hard and repeatedly when I have ignored this seemingly “insignificant” part of the insulin curve. Luckily, Loop has taken that setting off the table.

Does your T:Slim pump let you input various basal rates throughout the day? Does it let you segment the day with insulin sensitivities that you select? Insulin sensitivity is the drop in glucose expected from one unit of insulin.

These are the two adjustable settings that I use on a regular basis. My basal rates vary from 0.4 to 0.8 units/hour. My insulin sensitivities range from 26 mg/dL/U to 38 mg/dL/U. Your needs will be different.

Does T:Slim have an exercise setting? Does the “extended blood to 8 hours” refer to an extended temporary basal rate?

I think, if you can play with the basal rates and insulin sensitivity settings you will not miss shortening the DIA.

Great questions @terry I’ll try to get to them later today. I’ve got stuff to do*

No rush, @CarlosLuis. One more question. Is your pump the Control-IQ or the X2 version? Or is Control-IQ and X2 the same thing?

I question that.

If I recall correctly, DIA of 6 hours would apply to the Walsh model of insulin action, used by beloved old models of insulin pumps from Minimed. I thought I knew that LOOP uses separate models for each specific kind of insulin, derived from the clinically-determined insulin action curves of each. Different insulin activity curves for Novolog/aspart, Humalog/lispro, Apidra/glulisine, Fiasp, Lyumjev, and Afrezza would mean that the effective insulin action calculated by LOOP is different for each.

1 Like

X2 is a model name for the t:slim pump. That pump came with an initial hybrid closed loop algorithm, which was updated to the Basal-IQ (low suspend only) for in-warranty pumps, and subsequently to the Control-IQ algorithm.

1 Like

I remember a time when the user could select the DIA model used in Loop but now it no longer allows changes. This is from a source I trust taken from the FB Looping group.

You do not have the option to modify your DIA within the Loop app; it requires a customization. I don’t know any experienced Looper using less than 6 hours. Conversely, some of the people that I respect the most in this community have customized to use a DIA longer than 6 hours because of the way that it slightly modifies the insulin curve.

Loop uses an exponential decay model based upon insulin manufacturers’ testing. Traditional pump therapy relies on linear decay and ignores the approximately 5-10% of insulin action that remains after 4 hours. This sounds like a small amount but will quickly lead to insulin stacking

https://loopkit.github.io/…/algorithm/prediction/…

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4454113/

I do use and log Afrezza into Loop and it calculates a much shorter DIA for it.

I am out of my element when talking about the T:Slim pump and its algorithm. I did an AI search asking for comparison of Loop vs T:Slim algorithms and found significant variations. I didn’t want to muddy up the discussion with a copy and paste of those findings and leave it to the curious reader to perform that same AI comparison.

I defer to others who actually have T:Slim experience for how to specifically answer @CarlosLuis questions about how set adjustments to his system that would serve him better.

Edited to add: I’ve now learned that Loop uses the specific profile with the unique onset, peak, and duration of that brand of insulin in its algorithm.

1 Like

It’s a bit ironic, isn’t it?

Loop evolved because people wanted to be able to control the algorithm and adjust it to their own personal needs, rather than taking what was being given by pump companies.

And now they have a one-size-fits-all duration.

No, I don’t see this as ironic. Loop allows much customization of the Loop algorithm, more than any of the commercial offerings. Advanced Loop users can customize the code to make the value for DIA whatever they want.

Loop, unlike commercial offerings, is open source and can be modified by anyone for their own use.

Since I am not an advanced user I don’t mind some of the fundamental setting decisions being made by the developers. These developers are often people who live with T1D or are the parents of young T1Ds. They are in this project due to a passion; they are definitely not of, for, and by a profit based corporation.

I have used Loop for 9 years now. It’s made a huge difference in my quality of life. Every statistic that I track has improved including TIR, time hypo, glucose variability, total daily dose of insulin and quality of life. Much of the diabetes metabolic drama has disappeared. Things are not perfect, but much better than before my November 2016 start of Loop.

The Loop developers have earned my respect because I can see and feel the improvements in my life that have arisen from the care and feeding of the ongoing Loop development project.

@Terry Back home and here’s my answers to your questions.

My issue with a fixed DIA is that the determination of 5 or 6 hours is probably based on an average of a group of people. It seems the only thing average about me is my shoe size. My size is never on sale. Antihistamines that are suppose to last x hours, for me are usually x-2hours. Lantus never came close to lasting 24 hours for me. True I went to split doses because of nocturnal hypos, but going to 3 injections gave me excellent flat control.

T:Slim with C-IQ active will auto adjust basal when BG is high, increasing above the set rate, when low decreasing below the rate, and if really low stopping basal altogether.Here’s a screenshot of it working like it should.


The green is BG levels, the blue is basal.

It will also do auto corrections, based on the set correction factor.

T:Slim has three settings, regular, exercise and sleep. I use sleep set to start at bedtime and regular. Exercise never worked well for me. When I am on a long bike ride, I am able to see my BG displayed on my bike computer. If it goes low I eat glucose tablets, usually 8 grams and then a more sustaining snack.

With exercise mode, I forget what it does, but It keeps me too high for my liking.

3 Likes

The graph in your response look great to me. It is about 6 hours of your overnight, an important period but it would be nice to see a whole day. Even better would be a 14-day AGP report or ambulatory glucose profile. Does the Tandem software include that report? It basically displays 14 days averaged together and displayed as if it were one day. It shows the median (50th percentile) along with the other percentiles of your data.

Here’s a sample.

The point I was trying to make earlier is that if you’ve set your basal rates and your insulin sensitivity factors well, the DIA hard-wired to 5 hours should not matter. Since I don’t have a real-world experience with Tandem, my thinking may not apply.

To produce a 6-hour graph that you’ve shown makes me think that the overnight basal rate(s) and insulin sensitivities must close to optimal.

1 Like

I am having problems getting my pump to connect to my Mac Book Pro. That means I cannot get the more extensive reports as well as update the firmware. This has been a problem not just with me. First I was able to connect using Safari, then was required to use Chrome. THe last time I got it to work I had to download MS Edge. before my trip to Connecticut last week, nothing worked. I plan to try using my son’s PC.

Tandem suppport was not help.

The screenshot I posted is not a recent one, but when I had my usual good control. The full 24 hours would’ve been 100% in my preferred range.

As to insulin not lasting 5 hours for me, that is my experience both with long insulin only and MDI.

Short Answer, yes

TSlim does have both an Exercise and Sleep setting. As @CarlosLuis mentioned, the Exercise setting generally keeps your BG higher than most would prefer under normal circumstances. I use it at work when I’m doing strenuous or physical stuff and there are not many other coworkers around in case I get into trouble.

The extended bolus is basically a square wave bolus of x units total broken into x units now and x units at y time.

1 Like