#50 March 2018 Update on My T1D Management

This is a monthly update on my glycemic management of type 1 diabetes (T1DM) using Humalog and Lantus insulin injections with resistance exercise and a ketogenic whole-food diet as described in my book, The Ketogenic Diet for Type 1 Diabetes also available on Amazon in print. My other book, Conquer Type 2 Diabetes with a Ketogenic Diet, is also available on Amazon in print.

Although glycemic management in T1DM will always be challenging, the low carbohydrate ketogenic whole-food diet definitely improves it and just as importantly reduces insulin requirements and can reduce the frequency of symptomatic hypoglycemia. Many of the diseases (cardiovascular disease, cancer, Alzheimer’s, and many more) associated with T2DM and “double diabetes” as part of T1DM are due to insulin resistance and hyperinsulinemia. The low carbohydrate ketogenic whole-food diet directly improves both insulin resistance and endogenous hyperinsulinemia in T2DM and exogenous insulin requirements in T1DM (i.e. reduced insulin doses).

March was the first full month of taking metformin at a dose of 2000 mg/day. I am tolerating it without any side effects. As you may know metformin is the first-line medication for T2DM, but can also be useful for those with T1DM. Metformin acts on the liver to reduce glucose production by suppressing both gluconeogenesis and glycogenolysis. I think this may be useful for those with T1DM on a low carbohydrate diet because the reduction in dietary carbohydrate reduces insulin requirements which in turn stimulates glucagon secretion by the alpha cells in the pancreas which in turn increases glucose production by the liver. This increase in glucose production occurs primarily from increased gluconeogenesis, but also some increase in glycogenolysis is suggested in some studies. In addition, metformin stimulates muscle uptake of glucose independent of insulin. Hopefully over time, I will be able to determine if taking metformin either reduces my blood glucose (BG), insulin requirements, or both. I am estimating that I will need to take it for 6 months to be able to make a before and after comparison. I should mention that a meta-analysis of metformin use in those with T1DM found the following:

“RESULTS: In total, eight randomized controlled trials were included. Metformin was associated with a reduction in daily insulin dosage, body weight, total cholesterol level, low-density lipoprotein level, and high-density lipoprotein level but an increase in risk of gastrointestinal AEs compared with placebo treatment in T1DM patients. No significant difference was found between the metformin group and the placebo group in HbA1c level, FPG level, or triglycerides level. No significant difference was found between the metformin group and the placebo group in the risk of severe hypoglycemia or diabetic ketoacidosis.” The reference is linked below. That said, there is a possibility that metformin could increase the incidence and severity of hypoglycemia while on a ketogenic diet, so caution should be exercised. A possible mechanism for this is the fact that gluconeogenesis plays a more important role in maintaining BG in those on a ketogenic diet than on a balanced macronutrient diet. If metformin reduces gluconeogenesis, then hypoglycemia could result if insulin doses are not appropriately reduced.

For the past several months I have detailed my treatment plan for my presumed left shoulder rotator cuff injury. Although it seems to be slow to recover, it continues to improve. On March 9th, I strained my left vastus lateralis muscle doing a snatch. That has set my training back. This injury could be just one of those things, or could be a sign of overtraining, not really sure which. I no longer have any of the other symptoms of overtraining since reducing the number of exercises to 2-3/day. In March, the post-exercise BG rise moderated considerably. This I believe is a combination of having the proper basal insulin dose and is related to the reduced intensity of my exercise because of the muscle injury sustained on March 9th. In March, I continued my post-exercise meal of 1/4 lb. ground beef with a small dose of insulin depending on the prior BG value. My daily protein intake is currently 1.6 grams/kg/day which may promote some additional muscle growth along with the stimulus of resistance training. According to research done by Stuart Phillips, PhD and others, as one ages a “resistance” to building muscle develops which can be overcome somewhat by resistance exercise and increasing dietary protein intake to least 0.4 grams/kg BW/meal and 1.6 grams/kg/day. This is the rationale for the post-exercise meal of 1/4 lb. 85% lean ground beef which contains 29.4 grams protein or 0.38 grams/kg BW in my case.

Glycemic Management Results for March 2018

My March glycemic results were somewhat improved compared to previous time periods although I did not reach my desired BG goal of >70% time spent with a BG value between 61 and 110 mg/dl. I had less hypoglycemia this month and none were symptomatic. My total daily insulin dose remained unusually constant in the low 30s IU/day during the month of March.

Below are my mean BG values, mean insulin doses, and BG frequency distribution for March 2018 compared to previous time periods. I have changed two columns to indicate the AUC mean BG and predicted HbA1c. AUC mean BG is the mean BG by calculating the area under the curve (AUC) of BG versus time. The predicted HbA1c uses the formula: AUC mean BG plus 88.55 divided 33.298. This formula is the least squares fit using my own personal mean BG versus measured HbA1c over many years. My particular HbA1c values are higher than many other individuals with the same mean BG. This is referred to as being a “high glycator.”

Post 50 Means Table

As discussed previously, exogenous insulin cannot mimic normal insulin secretion, so persons with T1DM should not expect to have truly normal BG values at all times. They just need to be low enough to prevent long-term complications and not so low as to cause unpleasant hypoglycemic symptoms or less common, yet more dangerous, consequences including brain damage, seizure, injury, coma, or death. I have set my target BG range at 61-110 mg/dl because values in this range are not likely to lead to harm or complications of T1DM. Your target BG range should be determined with your physician because one size does not fit all. Normal BG is 96 ± 12 mg/dl (mean ± standard deviation (SD)) and coefficient of variation is 13% which is the weighted mean from two studies of continuous glucose monitoring in healthy subjects. The standard deviation and coefficient of variation are measures of BG variability which I believe are important in T1DM. Clinical outcomes in T1DM (i.e. microvascular and macrovascular complications) have only been documented to correlate with measures of mean BG, particularly HbA1c. This does not mean that BG variability is not important, but it just has not been documented to correlate with outcomes and complications of T1DM. Achieving a normal standard deviation or coefficient of variation in T1DM would be difficult, if not impossible, with current exogenous insulin therapy (injected or pumped). Monitoring the standard deviation and/or coefficient of variation and finding ways to improve them to the best of one’s ability is desirable in my opinion. Following a low carbohydrate ketogenic diet is one such method of reducing BG variability, mean BG, insulin doses, and hypoglycemia. A ketogenic diet may also provide an alternate/additional brain fuel in the form of ketones to protect the brain when BG does go low. The alternative energy that ketones supply to the brain may prevent or blunt the sympathoadrenal response to hypoglycemia which in turn reduces or eliminates the symptoms of and harm from hypoglycemia. This hypothesis needs to be tested before it can be stated as fact. Having mild asymptomatic hypoglycemia adapts the brain to lower BG and reduces the symptoms of mild hypoglycemia and potentially the harm from hypoglycemia due to lack of activation of the sympathetic nervous system by reducing sympathoadrenal-induced fatal cardiac arrhythmia.

Below are my BG readings along with the Humalog (rapid-acting insulin) doses in March 2018. I adjust the breakfast (blue circles), post-workout lunch (black circles), and dinner (purple circles) meal-time doses based on the pre-meal BG reading and take extra correction Humalog doses (red circles) for high BG readings as needed. I continued my previous pattern of high BG readings after weightlifting although they were less frequent and to a lesser extent as mentioned above. This is primarily controlled by the basal insulin (Lantus) dose taken at dinnertime but that dose is determined by the fasting BG reading and thus cannot be adjusted to optimize BG at all times of day. In those with T1DM the basal insulin dose may be enough to compensate for the increase in BG with intense exercise, but may additionally require a rapid-acting insulin dose to lower a high post-exercise BG.

Post 50 BG vs Humalog doses graph.png

The table below shows the BG variability results for current and previous time periods. The percentiles (10th, 25th, 75th, 90th) on the right show the spread of the BG readings about the median. The interquartile range, the difference between the 75th and 25th percentiles, is a measure of BG variability. In the middle of the table are the %Time in three BG ranges: %Time BG < 61 mg/dl (hypo) and the mean BG during that time, then %Time BG 61-110 mg/dl (target) and the mean BG during that time, and %Time BG > 110 mg/dl (hyper) and the mean BG during that time. Both the %Time with hypoglycemia and hyperglycemia are probably overestimates because they do not account for the corrections with glucose tablets for hypoglycemia or rapid-acting insulin (Humalog) for hyperglycemia. Measuring my BG more frequently or using a CGM would result in a more accurate estimate.

Post 50 Variability Table

The daily insulin dose totals and BG readings for March 2018 are shown in the graphs below. You can see a fairly steady total daily insulin dose during the month with a few spikes to address hyperglycemia.

Post 50 BG vs total insulin doses graph.png

The daily insulin dose totals for 2018 are shown in the graph below. You can see a steady reduction in insulin doses since the peak at the beginning of January 2018. The measures I have taken to reduce this variation in insulin dose has included keeping meals and exercise constant and have added metformin to suppress liver glucose production. Specifically, I try to keep all meals constant in terms of portion size, macronutrient composition and timing of my meals. In addition, I try to keep exercise constant including frequency (daily), type (the type of weightlifting exercises, mainly compound movements), intensity (gradually increasing weight over time as tolerated), and volume (repetitions). That said, keeping exercise intensity constant from day to day is nearly impossible.

Post 50 Insulin Doses in 2018 graph

The graph below is a new illustration of the distribution of BG values in the ranges indicated at various times of day. This could be useful to point out problems (hypoglycemia and/or hyperglycemia) at different times of day.

Post 50 %BG values in different ranges graph

The graph below is also new and illustrates the percentage of time spent in three BG ranges for each day of the month of March. The numeric percentage is shown for the % of time BG was between 61 and 110 mg/dl (green bar).

Post 50 %Time BG in Range graph

In April, I will continue olympic weightlifting every day with 2-3 exercises per day. I will also continue metformin 2000 mg daily which I divide up as follows: 500 mg with breakfast, 500 mg with lunch, and 1000 mg at bedtime.

My Thoughts About Management of Type 1 Diabetes With A Ketogenic Diet

My goal of glycemic management in T1DM with a ketogenic diet is to keep BG as close to normal i.e. 96 ± 12 mg/dl (mean ± SD) as is safely possible (i.e. avoiding hypoglycemia) to avoid diabetic complications, a reduction in lifespan, and unpleasant symptoms of as well as injury and death from hypoglycemia. For me, a well-formulated whole-food nutrient-dense ketogenic diet, daily exercise, frequent BG measurements, and lower insulin-analog doses (Humalog/Lantus) have improved my glycemic control, hypoglycemic reactions, and quality of life. My basic diet philosophy is to avoid processed foods especially those containing refined carbohydrates, sugar, and vegetable (seed) oils while enjoying whole foods (with just one ingredient) as close to their original state as possible. I think just knowing the guidelines in this paragraph would be a good start for those wanting to improve their diet. To treat diabetes, the additional step is to eliminate all foods with significant amounts of carbohydrate to keep the net carbohydrate total < 50 grams/day. Some may do better with < 30 grams/day, while others who exercise a lot may do well with < 100 grams/day.

My current version of ketogenic diet is as follows:

What I Cook & Eat

  • Beef, grass-fed, including meat (85% lean), heart, liver, and kidney (liverwurst)
  • Fish, mainly wild Alaskan salmon
  • Lamb occasionally
  • Chicken & Turkey occasionally
  • Chicken Eggs
  • Non-starchy vegetables (about 5% carbohydrate content by weight) including Cabbage (Red, Green, Napa), Kale, Collard Greens, Home-made Sauerkraut from Red Cabbage, Bok-Choy, Broccoli, Cauliflower, and some others.
  • Fruit – Avocado, Olives, lemon juice on fish
  • Nuts & Seeds – Pepitas, Macadamia, Brazil, Pecan, Walnut, Pistachio, Cashew.
  • Note: I developed an intolerance to milk prior to my diagnosis of T1D. I did try heavy whipping cream after starting my KLCHF diet, but am also intolerant of it. I do tolerate butter, but wanted to decrease my fat intake, so eliminated all dairy including cheese and yogurt.

What I Drink

Water (filtered by reverse osmosis), Unsweetened Tea & Coffee

What I Don’t Eat

  • Grains – Wheat, Corn, Rice, Oats (there are many more) or anything made from them, which is too numerous to list here. Gluten is a protein present in a number of grains (all varieties of wheat including spelt, kamut, and triticale as well as barley and rye.) which can cause a number of medical problems for a significant portion of the population with gluten sensitivity or celiac disease. In my case, I avoid them due to their carbohydrate content.
  • Starchy and most root vegetables – potatoes, sweet potatoes, yams
  • Legumes – peas, beans, lentils, peanuts, soybeans
  • High sugar fruits – includes most fruits except berries, see above.
  • Sugar and the fifty other names used to disguise sugar.
  • Vegetable Oils – Canola, Corn, Soybean, Peanut, Sunflower, Safflower, Cottonseed, Grape seed, Margarine & Butter substitutes, Shortening.
  • All Processed Foods.
  • I avoid restaurants except when traveling, and then order fish or steak with plain steamed non-starchy vegetables (no gravy or sauces that typically contain sugar, cornstarch, or flour) or salad.
  • Refined, but healthy, fats – Although there is nothing bad about including butter, coconut & olive oil in a ketogenic diet, I have eliminated refined fats from my diet to improve my body composition.

What I Don’t Drink

  • Colas (both sweetened and artificially sweetened).
  • Fruit Juice except small amounts of lemon juice occasionally.
  • Alcohol (can cause hyperglycemia or hypoglycemia in persons with diabetes).
  • No artificial sweeteners: I don’t enjoy them.

My exercise regimen often results in post-exercise hyperglycemia which is a normal response to intense exercise. However due to having T1DM, my body is unable to correct this without taking exogenous rapid-acting insulin (Humalog). The exercise I choose negatively affects my glycemic control to some extent. I’m sure I could find an exercise that has less impact on glycemia, but I enjoy weightlifting and feel it has health-span and life-span extending benefits which may compensate for the temporary increase in BG during/after exercise. Hopefully my BG values and variability as well as the relatively lower insulin doses that result from my ketogenic diet, exercise, and hopefully metformin (yet to be determined) are close enough to optimal to avoid any reduction in lifespan, diabetic complications, and harm from hypoglycemia, but only time will tell.


Efficacy and safety of metformin for patients with type 1 diabetes mellitus: a meta-analysis – here

A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults – here

Continuous Glucose Profiles in Healthy Subjects under Everyday Life Conditions and after Different Meals – here

Variation of Interstitial Glucose Measurements Assessed by Continuous Glucose Monitors in Healthy, Nondiabetic Individuals – here

Severe Hypoglycemia–Induced Lethal Cardiac Arrhythmias Are Mediated by Sympathoadrenal Activation – here



  1. Lisa

    Thank you for documenting what you are doing – it is so interesting. I appreciate the balanced way you explain everything too.
    -Lisa (type 1, 34 years, not doing keto as such but matching insulin and food to get nice levels anyway). Many thanks for sharing what you are doing.


    • Keith Runyan, MD

      Thanks Lisa for the nice comment. Sharing information is one of the positive aspects of the internet. With so few people trying a low carb diet for T1DM, I thought this blog might help others. It’s comments like yours that confirm it.


  2. Ian Pirie

    Hi Keith, I have recently read your Type 1 book on Ketogenic diet. How frequently do you monitor ketones?
    I have started the diet approach and have Medtronics CGM both my basal and bolus doses have decreased with decreased hypoglycaemia. What’s most noticeable is the lack of swinging of BGLs. Most grateful for your contribution to diabetes management. After nearly 40 years it’s a breath of fresh air. Thank you.


    • Keith Runyan, MD

      Thanks Ian, that is why we wrote the book. After measuring my own ketone levels intermittently for about 18 months, I felt that the main benefit would be for those who were not sure if they were restricting carbohydrates enough to minimize their effect on blood glucose. Basically, you should have a blood ketone level >= 0.5 mmoles/L most of the time while on a ketogenic diet. However, I do not think it is “required” to monitor ketones once one understands the principles of the ketogenic diet. In the first several months, urine ketones will give that same information with less cost compared to blood ketone monitoring.